Welcome from Fort Worth, Texas.
Get yourself a good accounting software like Quickbooks.
Make it easy for your clients to pay you by emailing them invoices through Quickbooks which contain a link to pay their bill online through Quickbooks Intuit Payment Network. This is an electronic funds transfer from the client's bank account to your bank account. It only costs $0.50 per transaction.
Create a standard service agreement form that only requires you to enter the amount you will be charging so that you can quickly fill out the form and get the client's signature. Make sure you get your proposals back to the potential client as quickly as possible.
A. W. Landscapers, Inc.
Hustler X-One 60"
Wright Stander RH 36"
eXmark 21" ECXKA21 Mower
Stihl FC110 Edger
Stihl FS90 Trimmer
Stihl FS55R Trimmer
Stihl HS56C Hedge Trimmer
Stihl MS391 25" Bar Chainsaw
RedMax EBZ7100 Blower
Earthquake 16" Rear Tine Tiller
Honda 9" Mini Tiller FG110
2014 GMC Sierra Denali HD
7' x 16' Enclosed V-Nose Trailer
6' x 12' Dump Trailer
Equipment & Work thread: http://www.lawnsite.com/showthread.php?t=415830