Firstly, have a good scour around all the web trading sites you can to get a feel of what is done - and what shouldn't be done! From the one's you approve, try and emulate what they do and (most important) how they do it.
For some examples by people who really should know better click here
You say you have banking facilities. Discuss carefully with your bank before you proceed with this. It may be better to use a banking facility such a Paypal click here which, certainly in early days, can remove a lot of headaches about payments.
Remember that practical experience is a lot better than learning from a book!
Good luck with it