need help repairing an optiplex 3050

i have an optiplex 3050 (<Private data removed from public view. DELL-Admin>) 
it has a faulty power supply and i am planning to transfer all the components to another case so that i could bring it back into life
I need to know if the motherboard fits with any case and what kind of wattage is required fot the new power supply and all the adapters and cables required to make this work 
I am planning to upgrade the ram and add a graphics card along with a new case and power supply so that the new power supply can fit properly 
I am literal noob to thiss
all help will ne appreciated thanks