Rooted SCH-I545, working on Metro PCS now what? topic

Got my Verizon phone rooted and up and running on the Metro PCS network using helpful guides here. I'm on MK2 4.3. I'm a little bit in the woods as what to do next. I want to install a custom rom, but I don't want to lose my services to Metro PCS. I had to put in the APN and other information manually. I'm just wondering if it is ok to install custom roms now or will it mess me up. Any nudge in the right direction or recommendations would be greatly appreciated. I can send/receive calls, texts, and gps works fine. Not sure about the speeds yet, but every looks fast so far.

When will Lollipop be available for sch-i545? topic

Hello all,
Any info about the official 5.0 ROM's ETA?