I would like to have a core mod and then have my other mods use some items from my core mod. I tried looking this up but found nothing.

What exactly are you confused with? Just create a new class in your core mod that will serve as a global item library for all your other mods and move your items there. Remember to import that package to all your other mod classes and like this you will have access to them from any mod package.

I have a class that stores my items and I tried importing the package but it didn't work.

I think I got it, Thanks.

Nevermind, i don't got it. The class that i'm trying to import is:

 

import staffmod.core.common.item.MItems;

 

This is from my other mod that i have, completely separate, how can I make this work.

Add your mod to your workspace

http://www.minecraftforge.net/forum/index.php?topic=19177.0

 

After that you can either just straight up import your stuff or use GameRegistry functions to get already registered items (GameRegistry.getRegisteredItem?)

I put the mod in the eclipse mod folder but it doesn't work.

You need to add it to the build path..

Thank you