if you live nearby a model shop you can get one for $30 or £15 but takes a lot of time to put together and to mainly fly the plane, that takes a lot of practice!
Paint for a model airplane kit can be purchased at any Hobby Shop. Try Hobbytown USA. They have a great selection of models and paints. You can also find some on www.amazon.com.
You will have literally thousands of places online to make choices. You should try www.internethobbies.com/inplasmodair.html and www.tridenthobbies.com/airplane-model.
you buy a kit and do what the instructions say
This webiste has reviews of model airplane kits. I do not know enough about them to make a suggestion. Hopefully this site helps. http://www.jitterbuzz.com/cleveland_kits.html
Various hobby stores may carry RC model airplane kits, but for a larger variety and price options http://www.nationalbalsa.com is a website where you can browse and find what you're looking for.
Look under AD (not A-1) Skyraider model kit if you want to build a plastic model yourself. Also, warplanes.com has wooden models made to order. Search for Tamiya A-1 Skyraider. It is a 1/48 scale---very large model. There was one old kit built in the 1960's that was same scale. Nice model.
Building a flying model airplane from a kit is hard for some people but it really depends on your skill level and experince. Using a kit does help beginers because it comes with directions and pre-made parts.
kit
A radio control airplane kit is very expensive. They are usually in the hundreds of dollars. Radio control airplane kits can be found at more reasonable prices on amazon.
You can visit www.boingboing.com and order a fulls size model T car kit. You can also go to www/kitcarlist.com.
The most popular airplane model that they have out there today would be the diecast models . All different places sell them and you can find them online in all different places for different prices.
You can not do this as they will sell only to wholesalers who buy thousands of any kit at one time. Your best plan is to find a wholesaler in your country.