i have a little work here

We would say I have 'some' work here when we are not sure exactly how much we have to do or how long it will take to finish. If I had determined that I had a 'lot' or a 'little' work to do I would use those words. Q. Would you like to go for dinner tonight? A. I don't think I can, I have some work here I have to finish.

It means that you have a little work...;-))