im lost :( topic

First of all, apologies for such a question.

Im lost. Its been a long time since i browsed through this forum. I have my at&t m8 running slimkat 4.4.4 and twrp 2.8.1.0. Cant seem to update twrp, stuck on entering recovery. Right now i would like to update to lollipop but i dont knw where to start. Can someone please pin point me the procedures. What i need to do prior. Thanks in advance