Last year I tried to change my repertoire from 1.d4 to 1.Nf3, too and I made a thread out of it, which I recommend to read:

"An “opening junkies” journey to the Flank openings" 
(sorry, I don´t know how to set a link)

My "journey" was not very successful and after two corrchess tournaments I converted back to 1.d4 (to have more choice and a better chance for space advantage). BPaulsen´s comments were very helpful back then and if I remember right he told me very early to stop my try. Especially the c5 -lines were a problem.

Your try will be quite different since I did not play the Catalan and consequently avoided any king´s bishop fianchetto - lines. But the thread should contain at least some valuable information for you.

Four resources that address 1. Nf3 related positions:

#1) The "Opening for White According to Kramnik" series is a given. Yes, it is still relevant. No, it's not perfect in a number of lines so you have to know where to look, and how to deal with it. I'll point out three of them to get you started - 1. Nf3 c5 2. c4 Nc6 3. d4 is outdated, look towards 3. Nc3. It will be the choice in the revised edition. In the Hedgehog proper 7. Re1 Ne4 is outdated, so a good choice would be Amentanoitos' suggestion found here on a thread in the Flank Openings section. In the King's Indian the Bayonet is basically dead, so place attention on the Gligoric if you wish to play the more critical Anti-Grunfelds (more on this in #2).

#2) Supplement the Symmetrical English opening suggestions from #1 with Avrukh's repertoire approached via a 1. Nf3 move order. They're pretty much compatible. This is ideal if you're content with the Fianchetto KID and Fianchetto Grunfeld.

#3) There's going to be elements of Marin's upcoming repertoire that are relevant to a 1. Nf3 player.

#4) "The Dynamic Reti" and "A Strategic Opening Repertoire" are more on the periphery as far as critical 1. Nf3 theory goes, but may have suggestions that interest you.