Start here are get two free trees to get you rolling:
http://energysavingtrees.arborday.org/?PartnerCode=06903
We bought a very, very dilapidated house when DD was just 2 months old. We had no money and no child care and no landscaping funds, but I got out there and put that baby in a pack and play and worked my tail off every day in the yard. I literally cleared out decades of dead brush and trees and branches, edged new garden beds, weeded and sodded and seeded and planted...my husband and I built a new wooden fence by hand using wooden lattice from Home Depot. You can do it. It will be hard but amazingly worth it.