Hi Joli,
Welcome to the X-Cart community!
5) This should do the job:
http://forum.x-cart.com/showthread.php?t=16996&highlight=order+number+incr ease
10) You can change the max. upload size in php.ini
Some advice on SEO: If you want to rank high in the search engines it's way better to move the store to the root instead of
www.domain.com/store
A stock X-Cart out of the box is not so SEO friendly. You should at least install the free product meta tags and category meta tag SEO mods from BCS engineering:
http://www.bcsengineering.com/store/catalog/FREE_Xcart_Mods__Tips-p-1-c-7.html.
Lots of posts on SEO here in the forum and on the web. Take a look at
www.seochat.com
www.seomoz.org
www.searchengineguide.com
www.highrankings.com to start with...
Good Luck!