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then the CHARMM scripts are done with a program language only for CHARMM?
exists some tutorial to learn this?

Most of the scripts in this 'Script Archive' forum are working examples of CHARMM input scripts that experienced users have written (and tested) by hand. There are a few CHARMM tutorials on the web which can help people learn to do this for themselves, but learning to use CHARMM effectively is a process of many months. It is fairly difficult to do w/o some guidance from either an experienced CHARMM user, or at least someone very familiar with the practices and pitfalls of molecular simulation.

exists some way to make a cycle in CHARMM scripts?.

like in programming are "for, while, do-while" cycles.

Yes, via the LABEL, GOTO and IF commands (miscom.doc); there are examples in the Script Archive, but a brief summary outline follows--

set k 1
label loop1
:
(some CHARMM commands)
:
incr k by 1
if k le 100 goto loop1

The SET and INCRrement commands are also described in miscom.doc