It depends on your style I feel.
I would say, start with streaming on 1 site, followed by 2 and build it up from there.
Every site is different and have different traffic patterns. Some will be successful for you, some will not.
We stream on 6 sites at once, and only 2 or 3 provide any decent amount $100-200 per day.
Our setup is 2 PCs,
Primary for Streamate, Cam4 using SnapCam.
Secondary for Flirt4Free, StripChat, Chaturbate & BongaCams
Due to us being males, we only have real success on Streamate, Flirt4Free & Cam4.
Chaturbate is volatile, and StripChat & Bonga is mainly freeloaders and petty tips, although StripChat has provided around $300 in the past 3 months, which we make more in a day in the other sites.
Hope this helps.
- James and Aiden