Do your paperwork. Before you begin to make any networking call you should develop an effective system that can track all the names of your contact list and the dates and content of each contact made with them.
Keeping records of your contacts does not need to be a chore. Simply set up either an excel spreadsheet or a simple record card system with the following information.
Telephone contact details
Date of contact
Continue to evolve this system as you create an ever increasingly contact list. Cross reference all records and continue to keep them up to date otherwise they will be of little benefit to you when the time comes for some serious networking.