Re: first salmon rod for
Since you are asking about a 9/10 or 10/11 rod I must assume that you will be fishing for King Salmon. King Salmon in the 50 to 90 pound range needs a 10/11 weight rod. So I would go with the length of your choice in a 10/11 weight rod.
Now If you are fishing Atlantic or Silver Salmon a one handed 8wt would be a good choice.