as i mentioned earlier, look for the different skill lists, see where you fit, see what the minimum requirement for S and DIAC is because surprisingly, ACS requirement is different than that of DIAC. If you fit in both start gathering all documents for skill assessment, in the meanwhile start preparing for IELTS, see how much do you really require (take a point test from immi site and see how you qualify. if you are short of points you have to apply for state sponsorship as well.
the only state that does not want you to apply post assessment is victoria, i am not saying they grant you the sponsorship without assessment but they do tell you if you qualify for their sponsorship or not, if yes they ask you to submit assessment it means you almost have the sponsorship from them.
once you have skill assessment, you then apply for the visa with the same documents that you sent for assessment, well, not same but a few additions like spouse documents, marriage cert, birth certificate of child if applicable, ielts transcript etc.
i wont say it is easy but it is not even difficult, read about assessment for now, take one step at a time and you will do fine
but make sure you do the point test first so you know where you stand and what step you have to follow so that you can prepare for the state sponsorship while waiting for assessment.
as for state sponsorship, that route is the fastest right now, takes sometime for approval from the state but once you have it and you apply for the visa they take not mroe than a month for a case officer and another month or so for the visa. For teh state sponsorship you need comittment statement, funds proof, CV and a few other documents related to work/education (basically all that you send to ACS).
make sure your passport is in order, India passport formalities take forever, if you need change of address or anything else, get it done while you wait for assessment, if not, nothing like it
if you are stuck somewhere give us a shout, some or the other person will answer to your query
wish you luck