Ok... The first thing you need to do is establish a plan. There are many forms of email marketing, as well as all sorts of service providers. From Solo Ads, Contact Solo Ads, ezine ads, Newsletters, there is something for everyone and any business. You also have to remember that what works for some, may not work for others. So you have to pretty much do trial and error.
Finally, remember that you should get targeted email marketing services. If you have a dog accessories business you will lose money sending an email marketing campaign to cat lovers.
Also do keep in mind that the first email out of series have the highest CTR so you really want to put the most important information on this first email. Also dont saturate your subscribers email box. It will piss them off.