As someone pointed out, your 13 ? 30-30 is the way to go....
put a williams peep sight on it. and it shoulders quickly, ammo
for a box of 45/70 is $23.00 a box in my area, ammo for the box
of 30-30 here is $12.00. and it is found more frequently in stores.
its less expensive to buy a 30-30 than a 45/70. I own an 1895 Marlin
I relly like it. But, I have also been shooting a lever 30-30 since
I was 14, you may find you don't like levers as you get older....
You might prefer bolts, or semi-auto, or pump, or single.
Just about everyone who owns a few guns, has a lever 30-30.
usually it is replaced in time buy an 06, .308 or a few like
to jump up to the magnums. If it is at all possible, have your dad
or responsible adult that has your parents permission to let you
shoot a 30-30, 45/70, .308, .44 mag, etc, after you fire a few
you may have a better idea of what you like, and ones you dislike.
Good Luck.