[Toreno]

Since you are a new scripter, you'll better start with the new things and leave the old ways behind you.
In case you want to create commands with a better system, YCMD or ZCMD are the best for you.

YCMD link and tutorial;
https://sampforum.blast.hk/showthread.php?tid=169029
https://sampforum.blast.hk/showthread.php?tid=243042

ZCMD link and tutorial;
https://sampforum.blast.hk/showthread.php?tid=91354
https://sampforum.blast.hk/showthread.php?tid=244841

Also, with these you'll need sscanf which are stated in those tutorials.
sscanf link and tutorial;
https://sampforum.blast.hk/showthread.php?tid=120356

To create a good system which saves your server accounts, you will need a file reading and writing, and once again. ****** his Y_INI will be the best way to create such a thing since this is the faster and better with many new futures.
https://sampforum.blast.hk/showthread.php?tid=175565
https://sampforum.blast.hk/showthread.php?tid=273088

Hope this will help you for a start, if you will read every tutorial and repeat them.
You'll improve your knowledge very fast, enjoy.