Please also bear in mind that it's worthwhile doing an introduction as:

• it's polite
• it gives a little background about you to suppliment your profile (which you have of course filled in )
• and thus allows those replying to your question(s) to perhaps offer something a little more specific and helpful to you

Think of it a little like real life; you'd not barge in somewhere and demand information, help and so on - so try to apply the same social ruleset here