I just bought an A1 as my first 3D printer and didn’t even install Bambu Studio. It’s in LAN mode and I send it jobs from Orca Slicer on my Mac. Don’t see the need to monitor it from my phone.
Look at what clients have stated as their hourly range or project budget and decide if it's reasonable for the work involved. Then look at what they've paid others in the past to get an idea of what they are willing to pay. Apply only if it looks worth it because we now have to buy connects to apply. Expect that most of the time you won't hear back because they got 50+ applicants and won't take the time to contact all of them.