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Hi I too am a newbie. But I will give you some advice for the RGB cube make sure that the LEDs are of at least decedent quality because I have a 8*8*8 RGB that looks horrible because of poor LEDs. Also I have a PCB that I just finished designing for a 8*8*8 RGB if your interested in the file here it is (please note this is my first PCB that I have actually ordered use at your own risk) -- https://easyeda.com/editor#id=|ad006185dc854add810...Under step 8 there is a link to the schematic but it is not underlined and colored because I was having issues with putting only this link in. Here it also is -- (https://easyeda.com/editor#id=63a136d6b20f4aebaede857853e31526|e43c643b328347348d007d8a95e4a44a)Good luck!
4x4x4 Led Cube View Instructable »