Tabletops are probably the best way to start...no biggie, if ya' don't clear 'em. You can start out easy, landing on top and work up to landing on the downside....overshooting them can suck so do it incrementally.
On the track I built, I was severely limited on available space & material and had practically no terrain variances to work with. Most of my jumps are probably around a 45 to 60 degree angle, on the takeoff. I prefer distance, over height. Though it's eroded a bit over the years, my tabletop was 11 1/2 ft. tall and just over 73 feet, across the top. Be warned...building a tabletop, takes a LOT of dirt! I was lucky and had access to a crawler so I was able to compact it fairly well, as I built it. I roughed-out the jumps and then made several practice runs with my bike, to tweak the angles and set the distances for whoops & doubles.