Trojans open a port on a remote system to advantage.
Worms propagate by copying themselves using all techniques known, they often have their own smtp engine.
Virusses infect files.
I don't think anyone here will teach you how to write virusses, worms and trojans.
For trojans you will need to learn socket programming in whatever language you preffer.
If you are looking into the workings of virusses thelittleblackbookofvirusses is a good starting point.
Nowadays many malware combines features, so while it is sending itself to all your contacts it will install a backdoor and infect system files to hide it's presence.
Overhead the albatros hangs motionless upon the air.
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