Hopefully if your timber is well treated it should last you a good while, i have installed a softwood terrace here, using 2 coats a primer to protect against woodworm,damp rot,dry rot etc etc, then 2 coats of exterior stain which also protects from moisture etc.
As far as "
proper"
decking goes, its available in Baumax in Sofia, treated boards,posts,joists etc etc as you would find in the UK.... so presumeably also available in any other branches as well.
Sorry i know the info is a bit late for you starlite, but just having a catch up on the site in my first spare minutes for many weeks.