Give helpful, insightful answers. Be courteous and respectful. Add a bit of humor where appropriate. You won't attract hordes of followers right off the bat but you've get one or two more every day. Over time that builds up.
Answer to the point, logical, answer only those question which you have thorough knowledge. be logical, be polite, accept the truth if you are wrong, appreciate good and helpful answer, listen to others advice carefully and BE ALWAYS HELPFUL.