Visitor Visa - B2

Hello Brothers and Sisters, i m planning to apply for US visit visa in dubai on 1st november and plan to travel in x mas holidays to celebrate our wedding anniversary+x-mas + new year, with wife and 5 yr old daughter, is it very hard to get appointed , i mean is it busy or i should apply earlier..? i m from pakistan with no travel history at all , living in ajman from 10 years, working as an accountant with 10k+ salary , was planing to visit Georgia Tbilsi over the weekend to make my casea little stronger.! what do u suggest..? i will show 60k + dirhams bank statement, heard u should have 5000$*no. of members which in my case is 5000k $ * 3 = 15000$ * 3.68= 55000 dhs approx , hope it wil be sufficient, and how and where to pay visa fees..? should i hire any travel agent..? do i need to do medical insurance or something if incase i get visa..?
how much percent chances i have to get visa..?