Hi.
There are a lot of info in this site. Before I became an active member I looked around.
You can also PM some members and they can help you out. That's how I started.
It's important to be polite and introduce yourself.
But in order to answer your questions I have a few for you to think about:
1. What kind of experience are you looking for? Incall or Outcall? GFE, fetish, cosplay etc. As always YMMV.
2. What is your budget range?
3. Where are you located? Your options may vary based on that. The cost as well (traveling to LH, Zoning of Escort Services etc.)
4. What are your free times? (weekend , weekday etc.) Your options will depend on that.
I have a few tips:
1. Having a Japanese friend goes a long way. I was lucky to make friends quickly when I moved here 4 months ago.
My co-worker introduced me to the world of soaplands and pink salons. Never underestimate what offering a pack of cigarettes or treating them to shabu-shabu can do for you.
I've also gone on group dates (forgot the Japanese term) because of him.
2. Do some research. If you have some grasp of the Japanese language you can go a long way. Ads on the street, magazines and even DVD/CD shops.
3. You could check the reviews section of these forums. They are a wealth of information.
I hope this helps.