Welcome! 
It’s good to know we’ll have two programmers directly helping each other - it might help you both stick around longer than most. @SpasticMelon’s already part of the Slack group, which we use for discussion that doesn’t need to be posted publicly (such as helping programmers set up the dev environment). If you haven’t already, you should get an invite for it pretty soon. The Slack group’s probably the best place to report bugs as the programmers will respond quickest there.
As for what to read: