Is it with bottle or big tank?
If it is with bottles, you need:
Bottles, scale, hose, filling mouth and ball valve. That’s all you need.
In Nigeria, you can start with 50kg cylinder bottles. It depends on the size of tank you want and the location you are.
So, how do i explain about a business to a clueless person? I did explain all details including example not this words "depend".
First, i don’t know the capacity of tank you want do. Secondly, I don’t know know tye area or state you are planning to establish it.
Many rules here in my location that doesn’t work for other side, east and north too that’s why.
You should look for motorcyclist or Keke (tricycle) rider to be contacting to come take empty cylinders to customers. You should be doing deliveries to customers.
Once your business is going on well, you can get a bike instead of getting a van. Doing pick up and delivery is good but not for a start (don't start what you can't finish).