Scorekeepers Page
Here are some helpful links on how to keep score. However, for Rec softball you only need to keep the basics: Balls, Strikes, Outs and Runs -- so some of this may not apply. It's not important to know HOW the out was made, or to keep stats on the players. As home team scorekeeper, you're there to help the umpire keep track of the basics.
This is a guide for the basics: Scorekeepers Guide
Here are more detailed guides and there are also many mobile apps that might be helpful in keeping score.
How to Keep Score
Keeping a Scorebook Part 1 - video
Keeping a Scorebook Part 2 - video