My daughter had retinopathy of prematurity due to being born almost 3 months early. She had laser surgery and has worn glasses her entire life. She's now 15 and doing fine eye-wise. She gets eye exams yearly now same as we do, and her prescription barely changes.
Mostly it's not any different than anyone else wearing glasses. It's just more important to consistently wear her glasses as an infant so her vision will develop correctly. That's kind of hard to do, as she will want to pull them off, but just keep replacing them, and she will eventually relent.
Most new parents don't really anticipate making medical decisions early on. Know that you are more than capable of rising to the occasion and making appropriate adjustments. If you feel like you don't have enough information, keep asking your doctors questions until you do.
That's about as much as I can convey experience-wise, not knowing how similar your situation is to ours. My daughter has other more severe conditions, so I can't really comment on how her eyesight specifically affected her development. If you discovered the myopia because of developmental delays, there's a good chance she will eventually catch up now that you know what the problem is.
I would recommend seeing an opthamologist if you haven't already, especially if you still have unanswered concerns. They have more medical training than optometrists, and are more aware of connections with other medical conditions.