Hey,

 

I am looking for tutorial how to make custom item like egg which will be spawning mob from my mod.

Look up Jabelar's entity tutorials.  He spells out how to do the modentity eggs for 1.7.10 I think.  Its pretty easy to adapt to 1.8.

I can't remember why now, but when I tried it in 1.8, something was weird.  I'll have to go look tonight.  It ended up being useful to create a version like was mentioned above.

 

However, as dies said, got with the standard first.