First, the police gave you a pink temporary license good only for 30 days. After that time, you cannot drive, unless you request a stay with the DMV within 10 days from the date of your arrest.
Although I am not an immigration attorney, I am told by collegues that a 1st time dui will not prevent you from getting a visa. However, you are completely wrong to think that you can dismiss the case. No dui cases can be dismissed once you are found guilty!
As for your fine, it should be in the range of $1,800.
As for attorney's fees, it should range from $1,500 to $5,000.
If you hire an attorney, he/she can go to court for you without you ever having to go yourself.
Again, don't listen to your friends or other non-lawyers. They do not know what they are talking about. Get advice from a licensed attorney.
Good luck.