Well, we're assuming that he wants to improve his technique since he's posting a question on this site. I'm not saying that it's going to be easy learning to crack 250' with a putter, but in the long run you will be much better off if you learn how to both drive and approach with a putter. Very, very few top pros would throw a driver or even a midrange under 300'. I agree that things like wind, line shape, and ceiling height can change disc choice drastically, but my mindset is that if I can reach it with a putter, then I will always reach for the putter. I will guarantee that it will be easier in the short term to keep "discing up," but if you want long term gains, then you should start with solid fundamentals. I can't tell you how much I wish that I had learned about this topic earlier in my "career." It was a full year of hacking my way through the course with speed 9+ drivers until I really started to try and stretch my mids and putter out. You will gain control and accuracy and the slower discs tend to not be as punishing when you throw with the nose up or get off line. In general, they will stop closer to where they land and will skip less dramatically.
I agree with Chow in the fact that enjoying the sport comes before everything. You decide your level of commitment, and as long as you play by the rules and have fun there is no wrong way to play. However, if you want to excel at this sport, it usually takes more than just going out and throwing for fun. There are lots of really knowledgeable people on this site that can chime in with a lot more authority on the topic than me, and trust me when I say that you will get better if you follow their advice and work on your game.