I went from electric to nitro too. Welcome and you will love it. I run both and I still like nitro better. Filthy, Loud, Smelly and more Expensive but still love it.
I would look for used kit to start. Some here sell entire set of nitro set up when they are getting out of hobby. You may want to check out the sales forum.
Go to engine forum and study "tuning guide" as it is one of the most important things in nitro.
Lastly, as you may know already, you get what you pay for. Invest in cheap brand nitro car and you will want to buy a better one soon. I don't know what your budget is but if you race one of those big name brand electric cars, you will know what I mean. Good luck!