We are (hopefully!) moving to the Costa del Sol in the summer this year

. We will have accomodation sorted for the first couple of months, but will then be looking to rent. We currently own a 2 bedroomed flat on the south coast in UK, which we will hopefully putting up for sale (not enough equity to be able to rent out unfortunately

).
Can anyone give any advice on the cheapest way to achieve the move? We are looking to bring over my car (1.2 Corsa - 3 years old) and possibly putting most of our UK stuff into storage (although will be bringing electrical items like large TV etc).
What are the pitfalls that I should look out for? I understand that after three months I'll need to apply for spanish car registration and convert lights etc., is there anything else I'll need to do (i.e. register ourselves?)
Complete novice here and would welcome any advice anyone has to offer.
We have made two major moves in the past seven years, one from the UK to the Czech Republic, the other from the Czech Republic to Spain.
We took all our furniture, goods and chattels with us.....quite a large amount of objects and items. Our experience with the first move, when we took the lowest quote, taught us NEVER again to go for the cheapest option. For our second move, we asked for quotes from large, reputable international movers such as AGS, Crown and Pickfords. We chose AGS.
There was simply no comparison in the quality of service we got from AGS compared to the cheap UK mover. Apparently many of the cheaper UK firms use local sub-contractors of dubious quality. That was certainly the case in Prague. Our furniture etc. arrived two days after the contracted date, was damp and the 'removal' men slashed at wrappings with box-cutters and slashed good leather sofas. Complaints made resulted in indifference - no compensation.
Now.....we took, as I said, everything but the kitchen sink. In your case, if you have fewer items to move, what I have said may not be applicable. But if you are moving valued possessions, it's worth taking note of our experience.
As for your car: we brought a new LHD Merc with us which we stupidly had put on UK plates, although we bought it from Mercedes Nuremburg and had it delivered in Prague. It transpired that the total cost of putting it on Spanish plates would have been prohibitive as it was barely a year old. So you need to find out about the cost of transfer of your vehicle.
We decided to buy a LHD Landrover from a reputable LHD dealer in the UK. It was already on Spanish plates and the cost of transferring ownership -from the legendary one careful lady owner! - was less than £200.
So if I were moving from the UK to Spain, knowing what I have learned, I would sell my UK RHD car and buy a LHD preferably already Spanish-plated, ensuring that I had all documentation required for the transfer and that there were no outstanding fines on the vehicle - these are transferable to the new owner!
It is in any case illegal to be driving a UK plated vehicle if you are resident in Spain.
Hope the above is helpful..