1.) You can do it either one of two ways using triggers. With the create cargo units command, so they will automatically be there. Or if you want them actually moving in there use issue order - targeting unit - load bunker or something like that. If you want all of those in a bunker you will have to either change the cargo size of the units in the data editor, or change the maximum cargo a bunker can hold in the ability: bunker - load - unload (bunker). I'm not exactly sure how to get a hellion to be able to go inside a bunker yet, but all the rest should work.
3.) I haven't actually figured out the warping in effect part, but you can make it so he takes longer to spawn. Basically just take the warp gate train ability and change a unit into the hero you want. The info time part is the time it takes for it to finish building. Then you have to give your hero warpable ability. If you want to be able to place your hero anywhere turn off the power user behavior part of the warpable ability. Then just give your building the warp gate train ability.
4.) You can do these with triggers. There are some stuff like "init campain harvesting" which i think has them start mining. You basically have to make triggers for everything I think. I've never done those before so I don't know that much about it.
Sorry i couldn't help more, but I hope this helps a little
Alright I am currently having several problems with items.
1.) I currently have it so an item enables an ability. I want to have it so after the unit uses the enabled ability the item is removed. I have a trigger, but once the ability is used it removes the item before the ability's effect is actually used.
2.) I currently have another item that increases damage when held. I want to have it so that after the unit attacks a certain amount of times it is removed.
3.) Another problem that I have no idea the solution is I have a unit with an inventory, and every so often the inventory and equipment disappears. I think it has something to do with the Yamato Gun ability, because the only unit that is having problems is the one with that ability. Maybe something with the channeling of it.
If anyone has ANY idea on any of these please let me know.