Well first of all, bookmark those places to find auditions.
Second, I wrote an eBook aimed at brand new voice talent that are trying to figure out how to start. Its not the ONLY way to start, but its one way that worked for me.
Third, pick up a copy of this book. Read it, then read it again.
And after all that, dig through this sub and r/voiceover and read all the articles that have been posted.
There's a lot of good information out there.