If you take this step, you will join a mutually supportive community of Amateur Telescope Makers worldwide. It is a constant source of wonder to me just how easy it is for most amateurs, using extremely simple materials, to make telescope optics which often exceed the performance of those in commercial telescopes. You can do it too!
As with any new undertaking, there are things you need to consider before you dive in. I suggest that the following would be a reasonable course of preliminary action:
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UK ATM Resources
The Astronomical Unit