Checkout form creation for payment gateway

I need a form (html) that has various options for clients to choose from. This form needs to be able to be pass data to a payment gateway provider. I'm not sure how to do this and need help. I can provide the form that I need to mimic. Please contact me at: maeekul@gmail.com. I'm currently in Asia and can talk to you if I need to. Thanks so much.
Michael