You have to fund your account at a minimum level in order to open it. After that, you probably want to move more money into it, and quickly. Of these two methods, wire transfers are cheaper and faster than overnight mail. When you send your broker a check, the money is good clean funds a week or two after the broker receives the check. So you have to learn how to wire money.
All brokers have instructions on their web sites on how to receive wires.
Your bank can tell you how to wire money out of your account. Ask for written instructions. Ask for them now, and have them ready in advance. Yes it is more expensive than a check. No your broker is not interested in accommodating you when your check takes 5 business days to clear and the affinity program is running on a tight clock.