Hi podlod,
If you created those prints, there is an inherent copyright for you. Others are not supposed to just copy and save your images to their hard-drives without your permission or without paying you for it.
But since copyright laws and rules haven't stopped many people from copying things over, you can always put a watermark or something like that in your image, so even if someone downloads your image, it won't be perfect and clearly displays a water mark.
I have never personally done that, so I did a Google search and came up with the following post, which seemed pretty helpful, so here goes:
http://photoshop911.typepad.com/help...arking_ph.html
It requires that you have Photoshop, but if you don't, you can match some of the instructions with a different photo-editing software (e.g. I use GIMP
http://www.gimp.org and it's free).
Regarding the bank account, I may have misunderstood your question, but don't give out your bank account/card information. Sign up for a PayPal account (
http://www.paypal.com). There are different types of accounts (personal, business, etc) so you can send and receive money.
I hope this helps.
Sherif