Hey there. I'm sorry if this is against the rules but I want to link a couple of posts which I wrote for company registration in Bulgaria that you may find useful here:
1. 5 reasons to register a company in Bulgaria
https://medium.com/@n.p.penchev/5-reasons-to-register-a-company-in-bulgaria-1f54e9a89964#.61o3c9t85
2. Hwo to register a company in Bulgaria
https://medium.com/@n.p.penchev/how-to-register-a-company-in-bulgaria-6e77831040f#.q9ov1zhdr
3. How to manage a company in Bulgaria
https://medium.com/@n.p.penchev/how-to-manage-a-company-in-bulgaria-774aa99da3ed#.xvmh9oj4w