Hi Linda,
Good stuff on getting onto an online store. Definitely a good way to go.
It is one of those things, depending on how much you put into it (and spend on it) the more you will get out of it.
You can spend countless hours reading up on
SEO, social media, blah, blah, then even more trying to apply it.
An online e-commerce startup is usually something that grows up and develops over time. Unless you have big money to spend promoting it, don't be discouraged if you don't see much happen for awhile. Until people start finding you on the web it can be slow going. Not that you shouldn't do it of course, but just to be aware that it is an ongoing process. Posting on Facebook, tweeting, blogs etc all take up a fair bit of time if doing yourself.
In terms of marketing just promote the website as much as you can. Have an email signature that goes out with every email with the website address. Same on forum boards like this. Post it on your Facebook page and get your friends to like and share. Have all your shop stationary (letterhead, receipts, business cards etc) branded with the website address. The more it is out there the better.
Also just to consider when selecting your site URL, unless you have a very well know brand, it is usually better to go with something that describes what you sell. Eg, if selling candles, sweets, hammocks etc make sure that word is in your URL as it will help people find your site when searching keywords on search engines.
Good luck, I hope that helps some.
Mike