I have been teaching my self to play guitar for about a 6 months, I know how to play a lot of songs, some difficult some relatively simple, I have read through the basics of guitar scales and nodes, I even managed to comprehend bits of useful information from some of its complexities, Lately I have been sick of playing other peoples songs, I have begun making my own, I am having trouble making licks thou. I can make some pleasant sounding licks utilizing a single string, but i am looking for advice on how to incorperate all the strings and really get the tune in my head down on a tab.

OH BTW i use acoustic guitar, I love electric guitars but as a university student a good sounding acoustic was cheaper (no amplifier) and less baggage to carry