Plugin Command Help

What I would like to do:
Have multiple commands in the format /prefix <command> [arguments]

What happened before:
I tried having multiple commands in the plugin.yml but none of them had /iprefix and were just /<command>

How I fixed it:
Made the only command /prefix, and then check the first args (args[0]) for each seperate command. It works but if they screw up the arguments I have a country mile long If/IfElse/Else block from hell.

My question:

What is the correct way/best way to handle a predicament like this? Where if they use say /derp kill me it'll be registered as its own plugin with its logic and all? I hope this well worded, I tried to search for this but I couldn't even think of the right search terms and couldn't find anything.

 

Could you post some code?

 

Here ya go, http://pastebin.com/AgY8QZgS