Kozzie has the right advice, so listen to it. I'm not even a month into the sport and I can see the wisdom of better choices and quality.
Eye protection, get quality eye protection. For CQB you WANT FULL FACE. no questions. Broken teeth cost huge dollars.
Great boots, which support your ankles is a must.
King Arms M4 is best quality buy for the money, full metal gun ready to rock out of the box. I can tell you it's solid. It's what I bought.
Get a quality battery and charger, and a spare battery if you can afford it.
These are the essentials. If you don't have enough money, start saving, nothing is worse than trying something out, LOVING it, and then having something break or fail and having to walk off the field. Then your spending MORE money in the long run. Way more.