I miss /r/bass a bit, but I realized when I was going through all of the things I posted there, like 90% was patiently answering the same damned questions over and over again for newbies who simply wouldn't read the FAQ or even casually search for answers to their question:

1. Check the 9V.

2. The Rumble 40 is the minimum viable amp for that line; the feature set is such that it's a dramatic improvement over the 25. Yes, it gets loud enough to play casually with acoustic instruments and even a drummer with dynamic control, but you will want something bigger for audiences/outdoor/more players. If you can't afford the 40, buy a headphone amp for now (which will still be useful later) and save your money.

3. That IS a weird noise. Try moving your phone away from the amp/cable/pickups.

4. You are already good enough to play with others and you will get better faster the sooner you do so.

5. Seriously, check the 9V.