How to deal with HHs for off-cycle?

Decided a few weeks back that I wasn't going to participate in on-cycle. Not nearly prepared enough (was on a post-grad trip for about a month) and want to take time to get some real work experience and figure out where I actually see myself working and what I'm truly interested in. 

I have yet to have any intro calls with HHs, but received emails from them about scheduling which I haven't responded to. 

What is the best practice to deal with HHs, and how can I make it clear that while I did not participate in on-cycle, I am interested in off-cycle opportunities in the future? 

Is it best to keep the radio silence going until I feel I am fully prepped for interviews? Or reach out to them now indicating my interest in off cycle?

Thanks in advance for the help.