Can you be more precise what you mean by "start email marketing" ?
Do you have any existing website for which you would like to start email marketing or maybe some other existing business or infrastructure?
Or do you want to start everything from scratch?
I would suggest reading some good books from Amazon, you can search for "Direct marketing" and book "Write to Sell", which will give you a lot of ideas how email marketing works and how you should do it. But you will have to experiment with it, get a mailing system, build your mailing list and try different things.