Walk the loop and make sure you know where you want to put it. Really imagine your lines and what they would be like to ride them. So basically plan it.
Then if its shrubby get a brush cutter and cut the line. Then get a Rakhoe ($80 from bunnings) and rake and form the line. If its pretty open then just cut it with the rakhoe. If its grassy use a whippersnipper to trim it back and then attack it.
Use a shovel to do final shaping and berm building.
Its pretty easy just takes a long time to do.
Then ride it a lot.