hi howard,im sure there will be a demand for the services if you are based in the right area,offer good service at reasnable costs and advitise,iv got local a local auto blaster that i use and have heard of a local vapour blaster but have never used them,post would be an option for some people but i prefere going to the 'shop' and see what quality of work is like then drop and collect parts
as for other services powder coat/stove enamal is usefull as is chrome and you could also offer other paint service ie etch priming etc but the list is endless so depends on space and out lay costs etc you can afford!
good luck with it if you do set up maybe start small and work up?
mark