With only 89 posts.......
..........I suppose we should let you off as still being a bit of a newbie. This is a real can of worms you're opening (or perhaps you're chumming - do I smell makerel)? If you do a bit of a search on this subject you'll find out more than you need or really want to know. Basically, you're ratings are given by us, the forum members and you can give or take yourself. Have a play around with your mouse over and around both your and others ratings (green blobs as they are called - click on the x and tick) and you'll see how.
Buy it & Use it, then sell it and buy something bigger