I say have fun but have a direction/purpose??? Use the fun to make money for your purpose. LOL...I jumped into this hobby and became interested with vitage steel bikes and components but quickly realized I needed something more modern to ride without problems.
After 9 months I have figured out what I want to do for the moment. Thats what I like about this hobby too because I see other members collecting/riding different types of bikes and I can learn about them through their restorations and collections they show on the forum or Flickr, etc., and then maybe later change my "direction" as my interest changes. As you can see from my bikes on Flickr...I kinda went 3 different directions...but it was fun. Now I gotta sell some!
http://www.flickr.com/photos/umpire54/sets/