I have tried to install mysql 5.5 on Debian 10 but have not found enough information
You won’t find any information on 5.5 install to Debian 10. MySQL 5.5 is dead as can be and does not work on modern operating systems. 5.6 is also EOL and probably won’t work on D10 either. Best option is to start using 8.0.
Mysql 5.5 became EOL before Debian 10 was released. So that is the reason why you cannot find any information