While there are lots of good coaches (Such as ColliePoker above or QY himself, you could probably start with a GTO Wizard subscription and use their
learning plans, which provide structure and include an introduction to GTO, progress path that builds upon itself, drills, and training videos.
Between their private (subscribers only) and public (
Youtube channel) training videos, they provide a TON of high quality content that can help you learn and build GTO fundamentals. They also have a very helpful community on the GTO Wizard discord that can help with any questions they have.
GTO Wizard is the market leader for GTO, with a massive library of solutions for various stack depths, structures, rakes and other things. They have also recently added custom solving and nodelocking, giving them an even bigger edge over traditional desktop based solvers.
Perhaps for some poker players, diving right into GTO theory and practice itself may be too much, but for someone with a strong background in math and probability, you should be totally fine.