IF you owned equipment and could dig a pond on the land to get the dirt, you would still be looking at over $600 just for fuel. I was able to find a friend to help me and it still cost $1000 just to rent a second piece of equipment and pay him a little for his four 12 hour days.
You won't believe how much dirt it takes. I've always complained that there should be more tabletops on tracks. Now I understand how much dirt those damn things take. If you want to have a wide enough track so that there is more than one line, you will find that it takes close to 10 yards of dirt to build even a small (20') double with landing. I went through over 2000 yards of dirt very fast. Thankfully I have natural terrain to work with, or it would have gone even quicker.
Now, if you are building a small (1-2 acre) single line track, you will be able to get by with much less dirt and should be able to build it with a small Bobcat.
Start small, build easy, flat jumps until you learn the angles. Most people make the jumps way to steep initially. Things look different on a bulldozer or on foot than they do on the bike.