For the timer what do I use

For Single Segment, go to this page and follow the instructions on the right hand side - https://docs.google.com/spreadsheets/d/1Gl5qdpvA-XczrpuV8VOc5DhmZAAgLFkv6vd6D79YFFs/edit#gid=0

For RTA, I would recommend either WSplit or LiveSplit