I'm not real sure. For lvl 2's I think enough to fit everything you want should be fine. Hopefully someone else has better advice.
I don't think I went about it the best way. I just put together a Harby in EFT with T2 fittings, and set up a skill plan to get there. T2 guns I trained last. Then I added the skills needed to get into an Apoc with T2 fittings to it, again with guns last. I'm just going back now to work on support skills.
As Amarr, if you don't want to pull all of your hair out in frustration, stay away from missions against Angels. Their resists make our pew pew lazors pretty useless.
Added at: 16:12
Also, I didn't get into a Harby until I could fit T2 everything, except for guns. I didn't get into an Apoc until I could fit T2 everything, including guns.