Great, heres a few pointers.
Start the recording, and wait about 5-10 seconds, just as a way to gauge the white noise.
Start off by noting the date, time, location, and all persons present.
Ask a question.
Give any "spirit" a moment to answer.
Ask another question.
No talking over one another.
ABSOLUTELY no whispering. A decent recording will pick up whispering and may be misinterpreted.
If a weird noise happens, note that on the recording. For example, if you hear a car drive by outside, or an acorn hit the roof, say so.
If you hear a noise and don't know what it was, you can do 2 things. First is ask "Was that you?" Also you can go investigate. If you discover what the noise was, say so on the recording.
Try not to handle the recorder. If you will stay in a room for a few minutes, put it down (gently! if it is recording).
With my recorder, you do not have to speak loud. Speaking normally works fine. Yours may be different. You should probably test to see how loud to talk.
A technique some ghost hunters do is ask the spirit to bang on the wall, you can give that a try.
Another technique is to leave a ball on a level floor, and invite the spirit to play with the ball. If you do this, you may want to use a digital camera to record the ball. Some digital cameras can record for some time. My sister's records for an hour; though there has to be sufficient light.
I think that is all I can think of. I can't wait to see if you get any results! When do you plan on doing this? Will you want me to listen?