If I have income from a job and from cash assistance from income support, do I qualify for the simple tax return?

Public assistance is not entered on a tax return.    Just enter your W-2 income.  You should be fine to use the Free Edition.

As xmasbaby0 stated, you should be fine to use the Free Edition.  Enclosed is a link that may assist you to get started:

Basic Free Edition

@tlcluvsgigi2014