Chevy 3100 -49 air suspension problem

[Dundee]

I bought a Chevy 3100 -49, it has not arrived yet for me.
The purpose would be to install air suspension,the vehicle is currently at both ends of the leaf springs (These are apparently the original?).
The car does not have power steering, but the front is disc brakes.
Please tell me what would be the smarter the most sensible solution,I would like to in the car when the air suspension and power steering and front disc brakes at least.What would be a good front end and a rear end (I mean what you would have an "easy" to install and are affordable and where they could buy).
What would you recommend for air suspension and is it worthwhile buy a mustang 2 front end for example, which already includes air bags?
So I live in europe so here are parts may not be, so I would like to know good places where I could get parts ordered (my English is not very good so I hope you understand me...).I am grateful for all the help and all are welcome because I myself did not have any experience with pick-up!