Bbs Model What Type Of Bbs Should I Use?

What type of bbs should i use? - bbs model

I am new to airsoft. AEG does not want a high-tech. I have this model at Walmart. Here is a link http://www.walmart.com/catalog/product.do?product_id=6527851 I do not know what kind of bulletin board use. I've heard that the curve of, 12 many of the weapons that the 250 + fps. But I will not be 20 to buy, because I fear that my rank and power will be significantly reduced. Which should I use and how to reduce fps 20 s, and range