Ohai! Srs Internet Spaceship captain, here!
EVE is ultimately a game about setting your own goals and taking satisfaction in achieving them. Nothing else matters. Not your killboard score, nor the amount of ISK in your wallet, not even your spaceship fame. Not unless you make them your goals. And believe me, those are the really boring ones.
On goals themselves, there are two broad and inaccurate categories for them: in-game and meta-game goals. Former would include anything that somehow affects the gameworld - accumulate X ISK, build a corp with Y members, etc. Latter would include visiting every system in the cluster, collecting one of EVERY item (looking at you, Entity) in the game, figuring you what the heck is the big Sleeper mystery or learning everything there is to learn about every game mechanic, effectively becoming an living EVE encyclopedia.
IMO, metas are much more interesting, but to each their own. Again, I want to reiterate the importance of taking satisfaction in achieving your goals.
This should give you some ideas.
I've always thought of this as a bit of personal preference, but if you're looking at being a hardcore mission runner, a good suggestion is to pick a faction that has multiple Level 4 mission agents in a station. Additionally, since you gain standing with an NPC corporation more quickly than with a faction itself, multiple L4 agents from the same corporation in the same station is preferable. It will take much longer to grind up your faction standings to be able to pull missions from all agents in all NPC corps allied to a particular faction, so it's generally best to focus on running missions for that one corporation at first. Once you manage to get 5.0 or better standing with a faction, you'll be able to run L4s for any corp allied with that faction.
It is for this reason that I personally used to run missions for Theology Council in Amarr space. Theology Council has two L4 agents located in Sasoutikh, allowing you to pull multiple missions at once and run both of them before returning to station.
Next, if you're running missions you'll probably want to review a mission guide for tips on what ships will trigger new spawns and/or how to blitz the mission if your goal is to increase standing. Eve-Survival is generally regarded as the best mission guide around.
Lastly, don't take my suggestion of Theology Council as an absolute. It's merely the only system that I can think of off the top of my head that offers multiple Level 4 agents in one location. If you've got the time, I would encourage you to do some searching through the Eve Agent search to see if there are any other systems with multiple agents which might be better for mission running.
Best Answer
Here is CCP Explorer's blog on the event, including lots of data and comments by Goonswarm. Observing The "Burn Jita" Player Event.
I think the outcome is a bit subjective because the participants naturally want to admit that their efforts were effective, but I have seen a number of other players talk about how it really didn't do much beyond temporarily disrupting Jita and giving people something to do.
Edit: Another link, including some market data. Jita Done, Hulkageddon is ON!