*ma'am
1) What is your current setup on your 3DS? Are you running arm9loaderhax (a9lh) or boot9strap (b9s)? If running a9lh, which version? You don't choose the Decrypt9 option in GodMode9... You run Decrypt9 through Luma's chainloader (pressing and holding Start while booting your system then choosing Decrypt9). a9lh needs the .bin for Decrypt9, b9s needs the .firm for Decrypt9.
2) You just need to make the files9 folder. That's not the source of your problem.
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Simply follow http://3ds.guide. There will be a step in the guide that will have you move your emuNAND to your sysNAND so that you will keep everything.
I am looking at it but its not clear to me... only talks on fresh instalation.. And another doubt can i format my sd card? Or what files and folders i've to keep? Can you give me the direct link of that step?