Most attorneys require a retainer, I am no different. It depends on the type of case as to what amount I would require in a retainer. I charge an hourly rate that is prorated from the retainer depending on the amount of time I spend on drafting and filing a Peition/Motion or time I spend in court.
I accept cash, check, and credit cards.
If the retainer does not cover all of my representation then you then further payment may be required.