People You Know

Start with people you know – family, friends, former colleagues and employers, as well as your wider social circle, including your sports/hobbies/club communities.
 
Also consider professionals who may be able to assist you, such as your family doctor, solicitor, accountant etc.

School & University/College

Past teachers, tutors and professors

Alumni can be a good source of help, having been through the same process themselves. You can usually contact them via your school or university/college, or try LinkedIn Connections/Find Alumni.

Social Media

LinkedIn is designed for professional networking!
Identify and connect with people in the relevant line of business. See Find Out & Connect
Check out LinkedIn and the Twitter feed of companies you’re interested in, as they may post about
networking events.
 
Join groups and discussions to gain knowledge, share views and boost your visibility.

Professional Networking Events

Many industries hold specific networking events or conferences; search the Internet to find out what’s happening in your chosen industry or locality. See Professional Networking Bodies
 

Networking events can get really busy and some people will be in high demand; so prepare an elevator pitch to introduce yourself – outlining your accomplishments, degree etc., what you’re interested in doing and why you would like to talk to them.

Take a supply of business cards and CVs, in case you meet useful contacts.