Hi Valerio
As ozeclipse suggested earlier, Texereau’s book is an excellent resource. Some online ones that are also very good are:
http://www.bbastrodesigns.com/tm.html#myArticles
https://stellafane.org/tm/dob/index.html
A 16 inch mirror is a very challenging if it is your first mirror. Some have done it but most start with a 6 to 10 inch mirror and then move up. I’ve made mirrors by hand and by machine. Personally I think you need to make one or two by hand before using a machine. That way you have more of a feel for what for you are trying to get the machine to do. Most of the texts are geared towards working by hand too. A simple motorised turntable running at 1 to 5 rpm though is helpful for working by hand if you have one or can build one easily. But it’s not essential.
Rod