Well, I'm no pro, but I had the same problem when I first started LD'ing.

The biggest tip I can give you is to not get over excited. I know that is easier said than done, but that will be the biggest help. When you realize you are dreaming, acknowledge it, and let it go. Start rubbing your hands together to help you keep lucid. When you first become lucid, don't try to go running all over and doing a lot of things. I find if you stand still in once place and just keep rubbing your hands together, while looking around you and try to look at all the detail in the things around you, you are better able to stay lucid for longer.

I'm sure others have some great tips also, but that is what has helped me.