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Landscaping; retaining wall/s, lawn, driveway

I am a keen gardener but this is beyond me; I have a sloping rear section. Rear drops 2-3m across 35+m to end in a steep bank. Dips also present across slope due septic field. Would like retaining wall/s for top & bottom w fence at bottom and a gentle slope in grass to cover septic field. Front needs parking area defined; posts prefered. Front garden edged w same timber. Current hard fill leveled, raised & covered w suitable stone or recommended medium. Would consider something like asphalt to treat concrete drive also.