It might be a text book answer but you could start by getting a few books which speak about polyamory as well as reading a few poly blogs online. Sitting down and discussing the exact form you wish polyamory to have in your life may be helpful.
The Ethical Slut is often recommended.
I recommend Opening Up by Tristan Taormino.
You can Google to see if there are local poly organizations or social groups near you to start and get to know poly people from many walks of life.
There is a sticky thread under General Discussion with a few poly resources as well.
I hope that is helpful
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~Open up your mind and let me step inside.
Rest your weary head and let your heart decide. It's so easy.
When you know the rules.
It's so easy. All you have to do is fall in love.
Play the game.
Everybody play the game of love. Yeah...~