I use Paypal for my transactions. After a first initial conversation and approval for work begins, I will send you a paypal invoice. I ask for full payment before starting (because people have flaked on me and I do all the work and then they decide they don't want it any more and I put time and effort into it...soooo...this is why I ask for payment up front).
The great thing about Paypal is that it's secure and you can use any credit card you like. Nice!