OK, my two satang's worth...probably not much different from OddBall's...

#1 what is required to move to thailand, visa'a and so forth and who do i contact regarding this.
Several ways, but much to remember - and much dependant on your circumstances.
If you are over 50, you can get an OA (usually get and O and then convert to OA in Thailand) - this is a retirement VISA. If you are single you will need either 800k Baht in the bank (documented and for at least 3 months) - some consulates want this to be in Thailand, others do not have this requirement - or 65k/month (proof of this is required - usually from your embassy) or a combination of the two. If you have a Thai wife, its halved.
If you are under 50 and are married to a Thai, you can get an O visa, but will have to report every 90 days and leave every 12-15 months to renew the VISA - will need to show 40k/month of joint income (with proof) - there is no bank deposit (lump sum) variant any more. You can get a job/company (Americans can get Amnity status) and get an O B, but needas a work permit otherwise it expires. Otherwise, you can get an ED Visa (O ED) to study, say, Thai - you will need to report every 90 days and pay 1.9k each time and renew out of country each year. You can do this for a maximum of 5 years (if your courses advance), but rarely more than 3 so I hear. Other than that, a tourist Visa gives you 60-90 days and you can VISA run, but have to be out of country for 3 months in every 6. The 3m investment visa is no more, but there is a 10 m illion version still oipen. Or, if you're a gambling man, you could purchase a Gold Card. Look all this up on THAIVISA.COM.
#2 what is the cost of living like? i am disabled and recieving social security disability and get around $900 a month
With a weak Dollar and strong Baht, its painful. This is not enough income for OA or even marriage Visa. At around 27k Baht, you would struggle to survive unless you can suppliment that. Depending where you live, your rent will eat most of that. BKK will probably eat it all for anywhere half decent. Car insurance and electricity is also expensive. Western food is around about the same as in the west. Thai food is cheap, as is eating out, especially roadside. I personally think you would need more to have a happy life here. Medical is cheap, but still costs. I would suggest somewhere like Chiang Mai, housig is cheaper, here are a lot of expats, many retirees - has better weather than BKK and good hosptals etc. There are regular meet ups etc with other CM expats - and help groups.
#3 what is medical care like there and how costly is insurence for medical.
Insurance isn't that cheap - I suppose it depends on your profile and age too. Medical care is cheaper than the west generally. Hospitals are generally clean, efficient and very good. Chemosts can 'perscribe' drugs too (i.e. they can sell some stuff over the counter that are perscription only in some western countries) and are good for run of the mill complaints.
#4 can i get my disability check sent to thailand ?
Check out THAIVISA.COM forum, someone will be doing this and already explained how
#5 i understand i cannot own property but i can own or rent a condo, how costly is it to rent a nice apartment or condo ?
You can not own land (legally, although there are some loopholes if you are a gambling man). You can own a Condo (if over 50% are Thai owned in the block). Technically you can own the buildings, just not ther land. This can be protected using USUFRUCTs (discussed here before). You can lease for 30 years with a 30 years option on top (contracted). Renting is safer, but not much of an investment. Thais do not need much in the way of planning permission, so that beautiful house you just bought could suddenly be inbetween a night club and a motocycle repair shop (Thais often run such businesses from their houses, so being in a ready made street may not help this much) - renting avoids this, you move.
#6 can you own a gun in thailand, i have a concealed carry permit where i am now, what are the gun laws like there?
No you can not - unless you are a Thai citizen or have special exception (such as embassy guards etc). It is a serious offence to have one, and in Thailand, bloody dangerous as you could well be shot by the BiB (Boy in Brown - cops) - or by someone wanting to steal it or rob you.
#7 what is a nice area to live in ? not too expensive and a nice area.
Chiang Mai is my suggestion based on the very limited information you gave. It is cheaper to live in the sticks (almost anywhere around the edges that is not coastal), given your medical needs and apparant lack of knowledge of Thailand, I would go somewhere were it is easier to get fellow farrang (westerner) help and english speaking emergency services etc.
#8 how hard is it to learn the local language ?
Assuming you mean National Thai (Central Thai) and not LAOS, LANNA, etc, there are many schools and methodologies - some will help you with your Visa too. As a language, its tonal (like Chinese), so hard for the western ear and tongue to reproduce at first. However, perseverance wil pay dividends. Reading Thai script is much easier than pictographic texts (Chinese/Japanese/Korean/etc), but still quite difficult. This isn't too much of a problem though, many expats live here for decades and can not say much more than a few words - especially in major tourist areas.

One thing tough, why Thailand? Is there a reason? CamboIia and Vietnam are both up and coming areas, much loved by new expats and your money will go a lot further (and their authorities seem to want expats unlike Thai authorities).