It is very difficult to retrieve the data once you have deleted the partition. Then specify whether you want it to be primary or extended. You can have up to 4 primary partition, and up to 4 extended partitions on a drive. This is normal and expected. So, if you are using extended partitions, leave partition 2 open.
Most partitions are normally primary.
After that, you specify a partition number you wish to create. Then you must specify a size and location for the partition. The default starting place for the partition is the first unused cylinder. That is usually a good place to start. After you create the partition, you must then set its type.