Please take this as friendly advice: You need to read *much* more before you consider selling straddles. You should be intuitively familiar with delta, gamma, and theta, and have a plan for trade adjustments before you get in.
If you want to start with some short premium, take a look at Iron Condors first. Your mistakes won't break the bank.
I was really just trying to prevent the inevitable, "How long will $3000 in options last?" threads that would result after the poster's first straddle sale.