First time I started playing back in 2000 I started with a borrowed AEG and a pair of combat boots and some crappy Guchiflage, It worked for a while but I really did not care as long as I had fun.
This time around its adding up fast and I havent even gotten started.
Long story short, you pay as much as you want. But make sure that any money you invest goes towards useful things.
Gun, Boots, Googles are all required. Everything else is up to you.