You could have your eggs harvested, frozen, inseminated, and then implanted in another person. In a nutshell, they can save eggs, ovarian tissue (not helpful yet but medical technology is improving) or embryos. There is no guarantee that any eggs extracted from you would survive or form healthy embryos, though. It is a process that works better if you know who the donor would be, so you can freeze embryos in the first place, not banked eggs or tissue. Plus, there is no guarantee that the implantation of the embryo would 'take' in the woman you are with.
Beyond that, both procedures are invasive (for you in the first place & for your future spouse).This is an expensive route. It can be a painful (physically) route. It involves (hormone) drug regimens. But it can work. And, yes, you would want to do this before starting T, ideally.
Of course, your future wife may wish to bear children from her OWN eggs, with her own genetic DNA. Sure, there are women who are willing to serve as surrogates for others, particularly when someone close to them can't carry her own child. At the same time, your wife may wish that your kids have part of her too. Saying: well, you can be the surrogate is a lot like saying: you can go through the challenges and risks of pregnancy without getting the outcome of it being your bio kid! Some women will not like this idea. In fact, I would suggest that most women would think that it is selfish of you to ask them to carry YOUR bio-child at greater risk/invasive procedure to themselves, without regard for whether it is their bio-kid too.
If what you really care about is whether the child has your genetic material or looks like you, do you have any brothers or close male relatives who could maybe be sperm donors? That's the best way in my opinion.
There are reproductive endocrinologists and other doctors who can do a better job explaining your options to you. If you care a lot about having kids, you should probably plan to see one prior to starting T.
