I own a lawn mowing company which I inherrited after my dads passing in 2003. Any way I am currently studying to take the Washington State pesticides exam. With the economy slowing down and people cutting back on maintenance I thought I would expand our services to include lawn fertilizing and weed treatment. Now I will get to want I want to know: 1. What is the best and affordable skid sprayer? And also lawn gun to use? 2. What is a good liquid fertilizer and weed and feed? 3. Where would I look for these products? Thank you for your help!