I bought the form letters and contract from the lawnsite.com store. Paid for them online & had them on my hard drive 2 min. later. They were helpful & worth the few bucks. I had a bunch of stuff that I had drafted up on my own, but I thought a point of comparison would be a good thing. It was. Somehow, it's sometimes easier to edit another person's work than your own. I took parts of the stuff I bought online & will incorporate into what I already had.
I don't know what software package you have on your computer, but just go to "find files" and key in the word "invoice", etc. & see what comes up. The Works program has a pretty good invoice as well as a few flier go-bys. You can insert your logo right in there.
I used the form letters and my ideas to come up with my door hanger. I'm picking up 2,000 of them at the print shop tomorrow.