I started with a Solo as well, and I bought a Wooden Camera ultralight-looking arm (see link). https://www.adorama.com/wc233200.html?gclid=Cj0KCQiAwP3yBRCkARIsAABGiPoAm9MkV-G9dHmiheVEaMK56GafHVKk2GDJnr5IBC79j3-vwYrswocaAqwdEALw_wcB&utm_source=adl-gbase#close
I used the 1/4-20 stud thing that came with the Solo’s weights to tie down the ultralight arm on the “balancing wings” that fold down. You could also just use a 1/4-20 nut. As for monitors I would recommend anything cheap like iKan 7” monitors or anything light and that is affordable. I had an Atomos Ninja Flame that I used as my monitor and it worked well because it was bright enough and could record at a higher bitrate/codec than my camera could.
Will show pictures later.
Cheers and good luck! The Solo is a pretty good rig but once you start adding monitors and the requisite weights on the other side to balance the monitor, you’d need the vest and arm as well unless you’ve got pretty sturdy wrists.