Take a look at Trent Valley Model Railway Society, Sutton Coldfield Model Engineering Society, or Lichfield Model Railway Society.
Hopefully, you will find someone who has the equipment and the preparedness to tutor you.
Buy some books, and study them, you will, at least, have some theoretical knowledge before you start putting some of it into practice.
If you want some suggestions, PM me.
There are quite a few to choose from, some of which may be written specifically about your lathe.
Tell us what lathe you have, and you should, be able to, get some "wrinkles" from users.
Do not be over ambitious. make simple tools, which you can use in the fure, as learning projects.
In this way, you will become familiar with measuring equipment, drilling, tapping and using Dies, as well as lathe tools .
Make your mistakes on relatively cheap readily available material rather than expernsive castings!
Howard