I've often heard of similar situations, limited budget, not much knowledge, etc.
If you're going to start a business online, generally you should have budgeted out all your expenses etc. I hear a lot of people trying to start selling online, but have no knowledge. It's true that internet is the way shopping is going, but if you've not experienced it at all, you should definitely add to your budget to get expert assistance. The truth of it is, not many online stores will last.
Think of it this way, you own a brick and mortar store and pay rent. You own an online store and pay web development costs, hosting, domain, etc. Having had my own online stores, successful and unsuccessful ones. I really tell you to get some help with it and don't be afraid to throw a few pennys into helping it work correctly.
I recently helped with somebody who wants an online store and selling things, but she's not ever used facebook, never had an store before and doesn't even shop online herself thinking it will bring in huge amounts of money where the reality is, it doesn't... unless you hire people to market it, or put loads of time into facebook, social marketing, seo and more, you wont get much return for a long time.
I don't say this to be mean or rude, I just want to make sure people understand that sometimes it can be hard to begin with and don't be afraid to put money into your business, just make sure you do the research first and prepare yourself.