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If their ever were white holes at some early point in the history of the universe would they ever collide like black holes do? What would happen if two white holes collided, would they form a bigger white hole that spews out even more matter and energy?

I'm not sure if it its self has mass, a white hole is a singularity that expands so it goes form 0 volume to some number that I don't know about. So maybe after it expands it has mass, but I would think that the matter it is expelling has mass.
(If I'm wrong at any point I'd appreciate being corrected I'm not exactly an expert on any thing, just a science junkie who reads a lot and watches the history discovery and national geographic channel too much haha.)

But heres one more question I'd like to pose, If black hole has two ends and at the other end is a white hole what do you think would happen to the two white holes if at the other end their black holes collided.

Something without mass wouldn't have to obey the laws of gravity, so I guess they could collide (similar in comparison to 2 cars crashing into each other), but not because they are gravitationally attracted to each other.
So that would also mean that they could come very close to each other and yet not collide, since there is no gravity.

And by the way, white holes are only theoretical objects that were supposed to exist in our Universe's early years, but scientists are still unsure.