I used a Ouija board many years ago and was contacted by what we thought was a man who'd hung himself on my property. (That's what he told us.) He caused a lot of poltergeist activity around my house afterward. He also scared the crap out of my other friends who had been doing the Ouija board with me. He would come to them in the middle of the night as a silhouette in the doorway. When they called for their parents, their parents either couldn't hear them yelling, or just "physically couldn't get up." Also, we all became ill at the same time, the day after he said he was going to harm us.
15 years later, and long after figuring out how to keep him at bay, I found out that it was the spirit of a boy who, he thought, was just playing and giving us what we wanted (to be scared and excited about the experience). So, what I'm trying to say is, even if you luck out and get someone who doesn't intend harm, it can still cause problems that last a very long time.
Ouija boards, in my opinion, shouldn't be sold as a "game." You can have serious problems getting rid of something/someone who comes through. Ouija boards are portals through which ANYTHING can come. The spirit can tell you what you want to hear, but be something/someone completely different. I would be thankful that you haven't had any huge connection and hope that you haven't let something through.
If you insist on continuing, please find someone who has some knowledge about using the board and who knows how to protect themselves and you.
.S. Watch the movie "Witchboard" if you can find it. It's a little extreem, but the point of the movie is a good one