Welcome to oople
First thing we need is your location so we can direct you to the local clubs, that way you can pop down there & have a chat to the racers, don't be shy as the majority of racers are very laid back & will happily chat to you, i have met some of my very best friends at race meetings
Do you have any local hobby shops? maybe see what they stock although almost anything can be found on the internet these days & most hobby shops have websites or sell on ebay
Should have asked this first really but do you want to race? or just drive for fun at the park? this will help us advise you more on the right bits to buy as if you want to race at a club you will have to have BRCA approved hardcase lipos & motors, a lipo charge sack + a BRCA race licence, most clubs will let you race there 3 times before the licence is required but it is worth having it straight away for insurance
Anyway whatever you decide to do you have come to the right website