Get good.
For real: It's okay to start learning on flat ground. Once you are comfortable on the bike in general, the harder parts won't be as hard anymore. You can practice low speed handling on an empty parking lot with straighs, sharp corners and figure eights. Probably you can practice controlled starts with high pedaling forces by starting on flat ground in higher gears. You can practice riding uphill before you try starting uphill. Once you have all the components, go ahead and combine them.
Allways go with the next challenge one by one. Don't start with the hardest part.
(If the parking lot is large enough, also do some faster and larger lines, circles, eights and snakes.)