Welcome humanking,
For what it's worth (and I've been thinking this over since before I saw your post), here's my ranking, in increasing order of difficulty, of various Orbiter activities that you'll want to do:
1. Start in orbit, change your orbit (easy)
2. Ballistic re-entry in a capsule (fairly easy)
3. Docking, when within 100 m of your target and starting almost at rest relative to your target...final approach. (fairly easy)
4. Take off in Delta Glider or Blast off in rocket, and achieve orbit (medium-hard)
5. Setting up your burn and executing it, when heading to moon or mars, using IMFD or similar (medium to difficult)
6. Align your orbit and synch with your target, for example, when trying to rendezvous with a space station. (difficult)
7. Re-entry with a winged spacecraft, and flying to an airfield (difficult)
8. Returning from the moon, more efficiently than IMFD (difficult...haven't achieved this yet)
So: Plan your goals, download and read the tutorials...they're really helpful, and put together by the same people who frequent this forum. Of course the manuals are there and are very helpful, but the tutorials give a different perspective that can really clarify things.
Good luck
MT