just saw that youre 14.
I would try and help someone out part time so you can still keep your mowing.
this work is not cheap to get into, and it will take years to learn. forever, actually. but keep learning. watch how we do jobs, especially the seasoned members like Zedo, dvs, some other guys whose names are harder to remember. They be the Don with bricks.
also, watch youtube. no one is perfect and theres plenty of false info out there.
start with this vid on walls