That happens to me a bit when starting out as well. This happens because, in your case, you probably only had three hard points. (Hard skill points are the ones you choose yourself... none from gear, which are soft points)...the other were coming from gear.
By you bringing up the number to 7 via two more points skill points you put in yourself, you meet the min requirements necessary to be able to choose a second tier skill because the hard points finally went to five.
gogo
Thanks gogo. There is a lot to learn. Dobri can you help with the other questions? I have a lot of time to play tommorrow (Amercian time) and want to level up to around 25 hopefully.