It started with my husband wanting to explore his bisexual side without inviting a guy into our relationship(so I bought my first strap-on). I had no idea what I was doing so I went to literotica.com and found a TON of things that I was interested in trying both as a slave and a Dom.
You could try to find an online Dom initially. There are lots of things you can experiment with initially and than eventually either meet them in person or meet a new Dom in person.
It epends on the Dom/slave. Some Dom's don't want others talking to their pet. Some Dom's want to be asked before assuming they'll talk to you. "I am a humble slave who wants to ask you some questions if you wouldn't mind Mistress/Master?" Something along the lines of that.
Read the posts. I've learned alot by just reading updates regularly. Going to the Chatroom is fun. It's kinda embarassing to just jump in there the first few times you go, just remember to ask before you private message anyone. Comment on people's posts. Ask questions. Put an ad up for a Dom. You never know what will come out of it.