Hi @digiproduct
The docs can help you :) Make a ssh connection with Putty (Windows app), https://www.digitalocean.com/docs/droplets/how-to/connect-with-ssh/putty/
You can edit files with the vi editor for example https://www.tipsandtricks-hq.com/unix-vi-commands-take-advantage-of-the-unix-vi-editor-374
For your database is suggest sqlYog (community edition, this one is free). https://github.com/webyog/sqlyog-community/wiki/Downloads
You need a remote access to connect to the databae, check this tutorial https://www.digitalocean.com/community/tutorials/how-to-set-up-a-remote-database-to-optimize-site-performance-with-mysql