I’ll let you figure out how to orientate it using what you’ve learned.
Remember that you can get direction by doing (start-end).unit
Effectively you want to get the direction between the current position and last position.
After this you can create your CFrame for your part.
Remember, that direction is a unit vector and you will need to multiply it by a scalar in order to get a non unit vector with size.
Be sure to show me the finished project 
thank you so much. You deserve more then a solution.