How to best advertise a website business?

[Suzee]

Have started a business page on facebook.
Have nearly 700 likers.
Have FREE Postage. Have awesome product. Have good prices.
Have everything in stock, no pre ordering, or get your orders in & that rubbish.
Have AMAZING give aways & discount opportunities.
Pay facebook for posts to be seen by a much larger audience.
Reports of online sales up 26% last quarter.
Yet I am not making sales anything near than what I expected???
Would like to get a website but obviously only if the facebook page is super successfull...& don't see why it isn't when others are...have been operating a couple of weeks but had 600 likers when I launch my Catalogue.