For a start up visa you need endorsement and should be a new idea, an innovative idea etc. A language school is common, not new or innovative.
Start up visa also does NOT lead to permanent residence, which is mandatory before you can even think about citizenship.
Unclear what your skills and work type are. Unsure if you would meet the requirements for a tier 2 general visa.
Unsure what you mean by "haven't got any papers"?