oh forgot to let you know - to start a BST you need to be a donor or jr. vip with min 90 days old in BHW and more than 200+ post, with no infraction on your profile, once you post the BST ask the marketplace mod to check it and approve it
I would suggest you to contact the mod listed at the bottom of the BST page, my personal favorite are BIGBUDDY and recently MR. APRICOT