Visitor Visa - B2

hello everyone, i have been reading the posts here for a month now and im happy because its really helping a lot.. i am having my u.s tourist visa interview this coming aug.. pls pls someone give me advise as to how can i improve my chance of getting the visa, im 25 y.o, working in a call center for 1year and 4mos, have a land title under my name, and i have abank statements with my saving of 5oo,000.00 pesos.. would that be enough?.. i also have a business here aside from woring in a call center.... pls give me some advise. i hope i will have the same luck as most of you who has granted a visa. thank you so much and GOD BLESS. BTW, my purpose is to tour in las vegas, california and florida, im want to visit my friend who resides in nevada, and i want to go to california and wtch some shows like ellen degeneres, and i want to go to florida and go to the hometowm of my favorite and long time crush nick carter of the backstreet boys. i am only allowed for a 2 weeks vacation. thanks