Clean up my old website so that it runs smoothly.

My website is 10 years old and needs some adjustments. I make one of a kind items, so I change my pictures and items frequently--no "stocked" items. a. I need a user friendly menu/navigation bar on my home page and a small one on the bottom of all pages (with contact info, home page, links, etc). b. A smooth system of moving from page to page. c. A more friendly home page layout. d. I have 2 scrollbars on all pages and that is very annoying, but I can't get rid of it without causing other problems. e. I need a website-friendly search engine I need a website that I can continue to update items on my own. Thank you.