Mate i get you with the kit form which is a great learning aid but trust me, after a year of owner ship you will know every nut and bolt anyway, quite a bit of hands on engineering knowledge required.
Diffs need doing every year, bearings need doing every year, servos go tits up and on and on ...........
Find a local group on here or on Facebook and turn up, pick a few brains, see where they run and what they run, may give you a better idea if you want 2WD or 4WD, never had 2 WD myself and watching them they need a lot more skill to drive around a track but are great fun too.
Oh and don't buy any real cheap stuff as it is generally awful, stick with the main brands.
Cheers
Dave