[LegitimateCry10]

When n = 3, the azimuthal quantum number (l) will be -1,0,1?

[PyroLIZ]

The principle quantum number (n) shows the number of your shell (or period in the periodic table). In your case it's 3.
The azimuthal quantum number (l) shows which form the subshells at this level can have. It can be equal to 0 (for s), 1 (for p), 2 (for d) ... n-1. So it's 0, 1 and 2 for n=3.
The magnetic quantum number (m) indicates number of orbitals in a chosen subshell. It varies from -l to l. So  for l=2 there are 5 orbitals: -2, -1, 0, 1, 2.