[Q] Galaxy note 2 SGH-I317 with Straight Talk problems

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http://forum.xda-developers.com – I am a noob and need help with my phone. I have factory unlocked a Galaxy Note 2 SGH-I317 from AT&T and am using the straight talk network. The main problem I am having is that the phone will not send or receive MMS and the data is very slow. What do I need to do to be able to use the phone at full capacity, and get rid of all the AT&T b.s apps; with out losing the stock functionality. What is the latest rom so I can root this phone????? I have looked four hours all over the forums and all the answers are outdated and confusing. Thank you for all ( if any) help it is very much apprecia (HowTos)