It is a good idea to start with harness training before you try the jumps. The harness gives you some more control to keep your rabbit from running off. If there was a club you wanted to join and do competitions, you would need to have a harness and leash to participate. Some rabbits take to the harness faster than others. It is important to get an H style or similar one so it doesn't choke your rabbit. Some types of harness will tighten when on the rabbit (like when they pull on the leash) which it not safe.
To start jumping, start with a low jump. It can be 2-3" or just a pole on the ground depending on your rabbit. Get your rabbit to go over it. You can try treats to get them to go over, but that has never really worked for me. Most rabbits have a 'tickle spot' that you can touch that gets them to go forward. You can use that to get them to jump and get them going again if they stop. Once they get going over the jump, you can raise the bar by a couple inches. Don't raise it too much too fast, you want them to jump clear rather than jump high. Work on the basics before pushing them too much. It is good to set up a couple jumps in a row (with a few feet between them) so you can work on doing a sequence rather than just 1 at a time.
We get our film canisters are photo places. Walmart usually has them and will give them to you. You may have to ask around at different places as they are getting harder to find now.