It all depends on how you go about getting set up.
Lofts, you can buy new but there are always 2nd hand available as well as the possibility of converting a garden shed etc.
Birds, you can go and spend silly money from the feather merchants or get better birds from friends and local fanciers.
Clock, again there are a lot of 2nd hand for sale but many clubs have spares to help new starters on a loan basis.
It can be as expensive as you want to make it!