You may start with the documentation (e.g. press HELP in protracker). Almost everything is explained. Also the effect commands. It`s useful to have a printout of at least "effect commands" and "keyboard shortcuts". Try to experiment a bit. Load a sample and hit key "Q" in the patterneditor. Then add a effect command + value. Play it, change value and play again.
C-3 is the note
02 ist the sample number (01-1F)
1 is the command called portamento up
03 is the portamentospeed value
For questions open a new topic or search for one that matches because its a bit offtopic here.