How to make a score, jumping mechanic and gravity change via overlap of triggerbox for a pawn

I have been working on a project in Ue 4.27 using Blueprint Scripting . Its going to be something like rocket league and I’ve searched the whole internet but can’t find tutorials that I understand (I’m a beginner) and are for 4.27 on: How to make a pawn jump, how to make a score (Like a widget) for a pawn and how to turn off Ue4’s Gravity and make an artificial one so the car sticks to the wall. Oh, also its a Vehicle Blueprint from the Advanced car starter. Pls be as detailed as possible and PLS help. I really don’t want to give up

Pls help me