I am incredibly careful about who I use to work on my car. I'll always collect a handful of references, and would want to know that the business has some history so that I can see their work, see their track record of customer
service, and know that should they encounter issues they have the facilities an skills to fault diagnose.
I tend to see code as a single entity of the upgrade path. When choosing a tuner I want a company with some reputation, some vision, and a good history of VAG experience. I work my @r$e off to pay for my car, and there is no way I would use code from outside the well established tuners (Revo / GIAC / CC etc.....).
I can see the attraction to you wanting to do it, but I would honestly recommend getting some industry experience under your belt, then if you feel inclined starting up on your own later on when you have track record, but can offer more than just code. I don't care about your age, background or anything else about you personally, the above is based on my personal selection criteria, and I'm sure I won't be alone when it comes to protecting my hard earned investment. Now if you were selling bargain basement coilovers that would be a different matter as some people will prop their cars up with any old $h1t, but that's another story!