A lot of of being “good” at drawing is built off how well you can mentally turn basic 3D forms in space.
I studied with a lot of visual development artists who had us do drills like this – take a box and turn it in every direction. Repeat until you memorise.
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Step one: learn how to draw a straight line is my issue
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Indeed a good first step! There's exercises for that too - check out this Peter Han demo starting at timestamp 7:30: youtu.be/eaif0PpNMas?t=
(I studied with Peter Han and owe most of my skills to him)