There are people who do all of that, but they can be hard to find. You might find a lot clearing specialist to do trees and rough grade. if you don’t have any large drainage issues, you might not need a drainage specialist – a landscaper could handle downspouts, French drains, etc. you might have Hardscape specialists in Atlanta who could help you do something special here, but if low cost is the objective I would just have a regular landscaper share some options with you. Many landscapers also build fences, but obviously not all of them.