Welcome aboard Anthony, What a big start...I mean scale. Jims tips are a good measure to follow. For paints, get the main colours following the type and squadron you're building. If you're good at mixing paints and tone savvy you'll save some money. Only paints with tones like white, red, yellow, blue and metalics are stand alone and have to be bought. Can't tell you what's best for brush painting large surfaces as I use an airbrush for it but take a look at AK paints. There is a formula now that you can brush paint Tamiya paints with AK matt thinners.
Enjoy your build...I'm surprised Airfix didn't provide figures.
Cheers,
Richard aka Wabble