What are the costs of pursuing this dive?
 
COST TO PURSUE THIS DIVE:  
$0-Unlimited
 
You can definitely use YouTube, and free trials at many schools, to get started. Eventually, though, you are going to want to pay something to get expert instruction, and guided evaluation and improvement (and that costs money).

However, these days, Krav Maga schools are located worldwide. Even online.

In fact, some of the online Krav Maga schools are even better than in-person ones due to their clear, regimented, and progress-focused approach.