If i want to share a record using apex.

we use Accountshare to share account records using apex.

Does accountshare automatically enabled?? how to enable it??what are the steps we need to follow

I am having picklist with values as all country names starting from a to z .

But my client is having their business in 15 countries mainly for example america, india, japan,....

Here i need to get values of america, india, japan,... using controller and i need to display 1st picklist value as america and 2nd picklist value as India and 3rd picklist value as japan,....

I need to get values using controllers?? how can i do this??  I need to display all 15 country values 1st and all remaining 130+ countries values next.

I am having a trigger with trigger.old.

While i am inserting records will trigger.old fires??
 

How do we capture the user Data in VisualForce page?

If i want to share a record using apex.

we use Accountshare to share account records using apex.

Does accountshare automatically enabled?? how to enable it??what are the steps we need to follow