You can begin by posting an Interest Check thread here
(be sure to read the sticky at the top of the forum) and describe what you want from your game, its setting, the type of characters you're looking for and any special rules you want to follow.
You should decide whether you want to follow canon rules or make up your own or combine the two but being flexible with any rules you set down may help you find more interest.
Let people reply in the Interest Check thread, respond to any questions they might have and discuss their suggestions openly and respectfully.
That is the best beginning I've seen others use.
You might also look for other GM's who are running successful games and see if they can give you advice on their methods.The Oath of the Drake
thread is an excellent thing to read as well.
Hopefully, this will get you started and other members will chime in to offer more advice. We seem to do that a lot.