To be a little blunt, most web coders could redo your site in a few days. So you dont need to worry about getting the HTML and CSS.

What Web res has suggested is a very good idea, the CMS (content management software) software he has suggested and the sample page will give you the results you want. Use the new CMS to recreate the site anew then migrate your domain name.

However, you really need to go an look at a lot of websites, and see what is good out there, your website has "first time trying" written all over it and if you really want it to sell stuff, it fails to deliver that. You have a lot of products hidden within the body text, the shop side needs to be promoted to save money.

Its great that you have taken the first step though, and your ideas are good

You are right in thinking your paying too much for hosting, the only trick you need to sort out is getting the domain onto a new hosting company, provided you are not in a lock-in contract then you should be fine.