Hi Graham, and welcome to Guitarist Guild, and thanks for posting, it's appreciated.
What I have done for now, is to add your banner to the front page, one static and one in the random banner box. both of these should be seen down the left hand side of the front page. Also on various pages at the bottom in the random banners, these will change on each page load. Also added to links page here, https://guitaristguild.com/index.php?page=links
one banner link and one text link.
Hope this is ok with you.
Please keep us posted on any special deals. So what's hot and selling at the moment?