Cant help on the blacksmithing side of things. However, if you are looking to take blacksmithing up as a full time career I would recommend learning a bit about running a business and that side of things. There are lots of evening classes in marketing, website building, keeping accounts, setting up your own business and so on. Of course if you are looking to work for someone then this doesnt apply as much.
A lot of these activities you can work on and set up now before you end your Army career so you can get up and running as quickly as possible.