Before you start your spending splurge, slow down and take stock of what you own and can reuse. The camera is one that most people already possess. A few lenses, a tripod. Good. Apart from these, you may have a few small items like lens filters and off camera flashes. Write down your inventory, and search your basement and garage for photography equipment that you can use, or modify a bit to help in your studio setup.
Another reason for listing out your available equipment is the possibility of selling them off and getting some cash to aid your investment. Craigslist / local online listings are a way to go where the buyer can contact you, set up a meeting, and give you cash for the equipment. In my experience I found the local listings are the best way to dispose off the used items. You might not get immediate reply, but keeping the posting alive over a couple of weeks might get you some response.
You can get much more targeted responses if you are part of a local photography group and can list your items in those forums or sites. While meeting someone who responded to your ads, try to meet at a public place – like a coffee shop or a library. After all you are carrying valuable and costly equipment. Bring along a friend, both for safety and as a witness.
Selling on EBay and other online sites do reach out to a wider market, but the process of setting up a bid, packaging, and shipping can be a tiring process. For low end items, the setup and selling fees withheld by these bidding sites sometimes is not worth the monetary returns.
While selling online, watch out for scammers, riff-off dealers, time wasters and low ballers.