You can post as many works as you want to complete for this exchange! If you want to do one, then that is fine, but if you want to post multiple works, then you can sign up with those works. I'll post the summaries for claiming, stripped of identifying details such as potential creators, and then cheerleaders can pick which one they want to do. That said, whatever you post will be matched to a cheerleader!
As for contact with cheerleaders, that's really a matter between the creator and the cheerleader. The initial contact is by email simply because I can then give the creator and their cheerleader(s) relevant contact details and then leave them to it. At this stage I'm reluctant to have a criteria for how creators want to get in contact if only because that would involve a lot more juggling of timezones and availability than I think I'm able to do across an exchange where I'm not sure what the numbers would be. I'd rather leave that sort of thing to the individual participants, as you know your availability and timezone better than I would.
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As for contact with cheerleaders, that's really a matter between the creator and the cheerleader. The initial contact is by email simply because I can then give the creator and their cheerleader(s) relevant contact details and then leave them to it. At this stage I'm reluctant to have a criteria for how creators want to get in contact if only because that would involve a lot more juggling of timezones and availability than I think I'm able to do across an exchange where I'm not sure what the numbers would be. I'd rather leave that sort of thing to the individual participants, as you know your availability and timezone better than I would.