I take it you’re referring to the ‘Faction Standing Repair Plan’. There’s an active thread created specifically for questions and comments pertaining to ‘The Plan’.
Anyway, I suggest concentrating on completing Career, Circle and Data Center Agents first. Mainly because those missions can be completed rather quickly for a faster increase in Faction standing.
Another thing to remember is when starting out with low standing, you’ll see a much larger increase from the low lv missions compared to completing them with high standing.
Exactly, I do the same thing with the level 1 SoE Epic Arc, complete it for whichever Faction I have the lowest standing with at that time. It’s a great way to help balance out / equalize Faction standings when needed.