I need of a lot of help

I would love to be more green fingered unfortunately I'm not and my garden is going to waste. I would love someone to help show me the ropes and in return you can have as much access as is needed.

Facilities:
Hose / Water Source
Shed / Storage
Watering Can
Shovel
Rake
Weeding Hoe
Trowel
Type of Space: Back Garden
How it's accessed: Street access (front gardens)