Please post an active link starting with http:// to the exact blog in question so we can get started with helping you.
I also want to see if I can get people to advertise on it.
That's a no go on free hosted WordPress.com blogs.
There is no upgrade, aside from a VIP hosting upgrade http://vip.wordpress.com/our-services/ that you can purchase that allows blogger initiated advertising on a free hosted WordPress.com blog. You will have to hire a web host and set up your own WordPress.org install to run your own advertising.
There is only one advertising program called WordAds at WordPress.com and it’s for blogs on their own domains. Aside from a blog being accepted into WordAds http://www.wordads.co/ no blogger initiated advertising, retailing or reselling the work or products created or services provided by anyone other than yourself is allowed on free hosted wordpress.com blogs.
E-commerce transactions via shopping carts and the like cannot be conducted on free blogs from and being free hosted by WordPress.com. Paid content and/or sponsored content is not allowed.
On free hosted WordPress.com blog we can use a contact form and/or a PayPal donation button for sale of only products or services created or provided by ourselves.
If you do require an ecommerce site, advertising, affiliate links, paid or sponsored content you can hire a web host and get a free software install from http://wordpress.org
Refer to > http://support.wordpress.com/com-vs-org/