Welcome back Trissicar!
If I remember correctly you do mainly hunters, right?
At the lower levels it's really not too different from jumping an intricate eq course. Although I ride my jumpers a little differently then I ride my hunters. I get them more on their haunch (less long and low) and ride them right up to the base of the jump so they can power over.
When it comes to remembering courses the main difference is that you shouldn't try to remember by saying, outside, diagonal, outside etc like you would a hunter round. You need to start memorizing each jump by the number. That's jump one, that's jump two, etc. when the jump off comes around then you can just remember, it's jump 4, 2, 5, 3, 1. You'll also need to remember how many strides are in between each jump. Always walk your course so you know how each jump will ride, and that helps me remember the course. I know several people who bring notebooks with them on the course walk so they can write everything down.
DON'T worry about speed when you first start! My absolute biggest pet peeve are those maniacs to just run around as fast as they can. Believe me, when the jumps get bigger it will bite them in the butt. You get speed from making tighter turns, jumping at an angle, etc. So on the flat you want to get your horse as rideable as possible. Flatwork, flatwork, flatwork!