Canadian Not sure of what TYPE of Visa

I will be working in photographs/video taken in the US which will (in the future) require me to travel to the US locations and work for a US company(s).

I am desperately trying to gather ANY information about what KIND of working visa I require.

1) This work will require me to work for various different companies (referral from one company mostly)
2) I will be in the us 3-30 days at most
3) 10 working trips a year at most
4) I will make less than 10 000US year

Can I get sponsored by one company and work for others?

Do all the companies I work for be required to fill out a I-129? Then I have to wait for an issued I-797 from CIS before completing the work?

What type of visa do I need?

What forms are required to complete? (H1B-is for one company - but what about multiple)

help?

ANY responses are so much appreciated