start out very small and build you customer base with quality work. I wouldn't worry that much about buying all the tools that you need right out of the gates. Really step back and look at what you are REALLY going use, and need. Don't buy things just for show. Sit down and figure out the number of times for example that you might use an aerator doing the year. Figure out whether or not you will make a profit from it, and how big is the market for it.
All I can say is research, research, research.
Also I would have to agree with the offers, go on your own