You May require posting of bond with Regional Director at port of entry. You must have permission to enter foreign country at end of stay.
You must show adequate financial arrangements (including resources for traveling and staying in U.S.) to carry out purpose of visit.
You should show you have money or proof of support from friends and relatives in U.S. or abroad.
You should show there are ties sufficient between sponsor and applicant to ensure support.
You should provide documentary evidence showing all the above.