I'm having difficulty finding appropriate validation rule examples to build from. 

1. I'd like to create a validation rule indicating that if the Opportunity Stage equals Revist that the Close Date cannot exceed one year from today.  Is that possible? 
2. I have Professional Edition so user permissions are a bit different.  I would like to create another rule indicating that if you are not a system administrator you cannot delete Opportunities.  Is that possible?

Any help would be greatly appreciated!

N

I'm having difficulty finding appropriate validation rule examples to build from. 

1. I'd like to create a validation rule indicating that if the Opportunity Stage equals Revist that the Close Date cannot exceed one year from today.  Is that possible? 
2. I have Professional Edition so user permissions are a bit different.  I would like to create another rule indicating that if you are not a system administrator you cannot delete Opportunities.  Is that possible?

Any help would be greatly appreciated!

N