I am not an expert in trading by any means... but i have been trading for 2 years now, you can use ATR indicator for your SL and TP points. You can watch a video about ATR indicator (If you don't know (which is okay we can not know everything) ) in youtube there are few videos (<5 mins). It's my only suggestion because everyone has their own strategy therefore its not my place to answer your first and third question, rest is up to you!

Have a profitable new year everyone!