The work is not great but, it's a start and you will get a reference from the agency if, and when you happen to move on to another job.
Don't be too flexible on the work they will offer you.
You have to know in your mind before you see them on what hours you are willing to do and how far from you are willing to travel each day to work, don't get pushed into doing something you are not happy with.
They will accomadate you, If you are working, the agency your are working for are earning.
Good Luck