You would do well to stay away from the "Dark Side" as most like to call it. This isn't a game or movie. Power has nothing to do with it. Take some Psychology classes, and study Freud the Fraud some. His "bigger penis" theory, and all that junk. A lot of the stuff you know is for humans, not those without bodies.
Something I have learned about spirits is that they often contact YOU, not the other way around. Kids usually do not ask for them to contact them, but they do. Others, even adults, get contacted, against their will, and have to deal/adjust to this. But, thousands of satan worshiper kill and rape daily and never get contacted by even a low level demon, let alone Satan.
Oh, and demons ARE angels. Dark ones. Fallen. Bad. The ones who still serve G-d, in doing bad things that need to be done. Christians like to cut that out, but it is a fact anyway. A storm brings rain, but it can destroy too. The problem is, with demons, they are lost. They think they are free and think they do their own will, but they don't. They chose once, and were nailed to that for all eternity. Some of the smarter ones know this, and it really ticks them off. But, since they don't have bodies, they have to steal them to do some things. Angels usually don't, because they don't have to do such things. Think of it like the legal system. If you have a lot of open ways of doing something, why bother with the hard ways?
Really, more than anything else, get yourself ready FIRST. If you go in unprotected, you will get it, and hard. Life gives the test first, and the lesson after-wards. This is the same thing that happens in death. Be as ready as you can for the test, it's a killer. And, once you start in, you may not make it back.
The ouija board is just a crutch. It gives you a door/window/key to contact the other side. A call, if you will. Watch out for who answers. You can call over, or they can call to you. But, once done, that bond usually stays. There are all sorts of things past the veil that can "feed off" of you, harm you, and cause problems. Some are more sensitive to this than others. Some of us didn't ask in the first place, so...