Relationships are the common denominator of successful people. The more solid relationships people have the easier it is to draw on help, knowledge and support.
So how do you build relationships with anyone? Time and attention. By reaching out to people frequently you easily and quickly build relationships. Pick 5 people each day you are going to further the relationship with through a hand written note, a phone call, one on one time or asking a favor.
Relationships are like a muscle the more you exercise them the healthier they become.