Try something is much less parts kit before going into more parts. As for ST27 Supra...the kits come with lots of parts, and 2 version to chose, not a easy kit to build and you have to download some real photos before you begain. I think if you want to go to ST27, try McLaren F1 GTR, cause it contain less parts but still look good. (I got 6 ST27 Supra and 1 McLaren F1GTR) trying to get one more McLaren F1GTR soon....
1/43 scale: Provence Moulage, ABC, or starter kit will be a good start.
1/24: Le Mans Miniature....