Go through article Mehwish’s Voice Training Guide. It includes everything you need to know, as well as additional resources (Trans Masc section is WIP).

You can find examples of how control of different aspects of your voice sounds in the Selene Archive.

Once you understand the basics, the primary thing you’ll need is consistent practice. Use your voice wherever you can — reading a book out loud, talking in random voice chats, thinking out loud. Get creative.

Feel free to ask for advice in the chat voice training channel.