The template looks nice and professional, but I doubt you’d have much success selling a template as a .bsdesign file. There is not a single .bsdesign file for sale on envato marketplace. In fact, I couldn’t find a single .bsdesign file for sale anywhere on the web.
The .bsdesign file format is proprietary, and although you might be allowed to legally resell them (you’d have to check with @martin,) the only people who would be able to open them are people who own Bootstrap Studio. People who buy website templates typically don’t expect to have to also buy the software used to create them
Traditionally, people who sell website “templates” sell the actual generated assets (CSS, HTML, JS, etc…)
I’m not sure what the rules/laws are regarding the reselling of Bootstrap, but there are tens of thousands of Bootstrap-based templates for sale (there are 29,531 on Envato market alone!) So I’d imagine at least that part of it is legal. As long as you stick to Google fonts, you should have no issues selling a template that uses them. They’re all free for commercial use, and for sale in third-party apps (like templates.) You may need a license to sell templates that use certain icon fonts like font awesome. Of course, any imagery you use as examples in your template would have to be original artwork of your own creation. Otherwise, you’d need explicit permission from the owners of the logos.
Envato market is a pretty big place for people to buy sell templates, so you might start by going there, and seeing what’s involved in becoming a reseller. Trying to sell website templates on your own, through your own website would be like trying to sell a needle in a haystack. Chances are, nobody would ever find you. You have to sell through the big, established companies like…
Keep in mind there are tens of thousands of people selling website templates at this point, so getting found, and established is not easy. There are thousands of website templates on envato that haven’t had a single sale. Some of them sit there for years unsold. EVERYONE these days wants to either be a web developer or sell website templates. I’m on Quora.com, and get bombarded daily by people (mainly from India) asking how they can make money doing website development.
It seems like everyone thinks the path to financial success is freelancing. It’s not. You need to have a serious competitive advantage, or a really good niche product, or a well developed referral network, to make a living selling websites these days.