Assuming you've found a qualified broker that's willing and able to work with you "long distance," you'd simply contact him or her with your request. The broker will walk you through the rest, and all arrangements can be made through telephone and email.
IMHO, possbily the single most important factor is that you demand the broker perform prequalification for you. This can be done long distance, as well!
For more information, I recommend this life insurance quote web site, devoted to enhancing consumer awareness, through practical tools and information. For example, it contains a database of actual cases -- the majority were arranged long-distance, just as you're asking!
