In the first instance, check out these two articles addressing the various choices you have when deciding to contract with a payment provider or processor.
- Five tips to get started taking card payments
- Setting up card payments for retail and online selling
You could also contact your business bank manager. They can either set this function up for you or will be able to put you in contact with someone who can.
Note that you usually need to have a business bank account in order to receive credit or debit card payments.