If so, what are not acts of zina that I could preform to pleasure the one I'm marrying?
As long as you are not married you are not even allowed to be alone with a foreign person (which your to be spouse is).
Both of you are not allowed to talk about such subjects at all.
In the time before marriage the fiancées can only meet in company of a mahram of the future wife (or in public). The talk between them should be of a kind to learn to know each other to be able to decide whether or not they should go further in this engagement however the to be husband is allowed to see a bit more of his to be wife (of course not in public) as the appearance may play a part for the above decision. Intimate talk that leads to arausal doesn't fit to this.
So the answer is there's nothing that you may be allowed to do before you get legally married.
But if you for whatever reason had any kind of intimacy or pleasure before marriage this is counted as zina or a form of zina even if only zina with a penetration has prescribed punishment in the shari'a.