find a nice place that parents/community (home owners association) will let you(they like to ***** if you build them were they dont like them) and AWAY from the jump start digging a hole...you could also make the Gap the hole..if you have trouble digging then put logs in a pile and put dirt over them to shape the dirt jump..the hardest part is the LIP of the jump...since your just starting makeing jumps only make one and make it around 1-2 feet tall and the gap should be 2-3 feet. some websites have tips on building....and dotn forget when they get dry to water them so they dont crack