Home Studio Soundproofing

i am creating a home studio and i dont really know what i need this is what i got so far
Hardware: Korg Kontrol49 MIDI Studio Controller, OSP STM-1300 STUDIO CONDENSER MICROPHONE, KRK ROKIT RP5 RP-5 POWERED STUDIO MONITORs, Auralex D36 Acoustic Foam+Glue Kit Studio Soundproofing, DigiTech VOCAL 300 - VOCAL EFFECTS PROCESSOR, Ion Icue Computer Mixing System Pro DJ Station MP3 Ipod, Behringer Xenx 802 Mixer, Nady QH360 Studio Headphones , Tripod Mic Stand with Fixed Boom
Software, i have reason 3,and 4 nuendo 3, sonar 7 pro, acid pro 7, tracktor dj 3 and much more is there anything i am missing my question is do i need an AUDIO INTERFACE

well with everything that you have it really couldn't hurt to just get it. I think you are kinda over doing it but I don't have your vision. Good luck!