Deposit taken for my car. Not counting chickens yet but hopefully it will sell

Which allows me to think about a Cossie

So, if I buy a 2wd or 4wd with a more or less standard engine, what can I do straight away for more power?

A Superchip Bluefin is very tempting but should I be chipping it without other mods? Are there better upgrades out there?

Sorry for such a noob question but I gotta start somewhere