Need some help for vehicle control blueprint

Hello dear developer

To begin with , I recently started to work on a little project with my friend ( Programmer ) but some event happened and he is not able to work with me anymore . ( since the project isn’t that complex ) I think that I could manage to use blueprint and script things by myselft .

So there is the thing, I am working on a level where you control a luge and your goal is to go down the mountain. however the thing is that it is not an open world game so the level is linear ( not literally , you need to turn and control where do the luge is going , also the camera is 3dr person ) . I am not sure about how should I make the blueprint for the control system , because I want the luge to alway go at the same speed . Basicaly I want it to alway go forward by itself then the player would just have to move it on lateral axis. I am not sure about how to procede to achieve this mechanics but I wanted to know if you could help me a bit ( even just tell me the basics if you dont have that much time ) .

( also sorry English is not my natal language .I tried to write the best I could )

thank you