Congratulations! You seem like an incredibly motivated soon-to-be business owner! Your promotion ideas are good - and I'd like to suggest a couple more. Try your hand at some guest blogging. It will help with
SEO (by giving you a valuable backlink), but it also gives you a chance to get your name and link out in front of a highly-targeted group of people. If readers like what they see in you guest post, they could very well become loyal readers of your blog - or simply be impressed enough by your guest post to link to it (thus giving you more backlinks!)
I would also try some article marketing. That gives you a chance to do some writing that's a little more "formal" that blogs. You could always write about topics like self-esteem issues for plus-sized women, etc. Article marketing will also give you valuable backlinks, and also establishes you as an expert in your niche.
I would also find some forums for plus-sized women, add your link to your signature and become a valuable member of the community. Each post will give you another backlink, and, again, you'll get your name and link out in front of targeted traffic.
Good luck!!
