tape and joint

Hello I’m rebuilding old stud walls in my bathroom, which will then be painted. I’m wondering if I need to plaster them, or I can paint straight on tape and jointed moisture resistant plaster board? If so, is there any special compound or tape I need to use? Or is there another way? Thanks

As the lockdown is slowing everything down and no delivery at moment. I was wondering what would be the best plasterboard brand to use. Moast DIY sell Knauf or Gyproc? Are those any good? As I live near a train line I was wondering to use soundblock for ceiling as well. Is it worth the extra...