Start buying Practicle Performance Car magazine you will learn a lot about tuning cars properly (no induction kits etc), but cheapily (ie using motorbike TBs instead of expensive Jenvey ones).

Plenty of people are using motorbike TBs now so you should be able to find plenty of info on the net. You will need aftermarket engine managment which you could fit first as it will improve your engine performance even without TBs. Once you have mastered that side you could tackle adapting and fitting the TBs.