Group Shows and Networking
You might find it useful to join a studio group so as to build your network and put on a group show. Most studio groups have a notice board with opportunities, and members can pool their resources and put on group shows, taking advantage of each other's contacts and networks.
When starting out, you can apply for just about everything going - certainly everything you are eligible for. Consider every opportunity that is given to you and keep on applying even if you are persistently turned down. Once you begin to gain a reputation, be discerning about the opportunities you apply for - your public reputation is shaped by the experiences you have had, but your CV need not mention everything you have done. Postcards and flyers can be printed relatively cheaply and cannot be 'deleted' like an email message.