It is fine to use our services on videos that do not have monetization or adsense enabled as we run natural promotions for your videos.
However the YouTube Partner Program Policies specifies that you are not able to use third parties to promote your videos.
Read policy here: https://support.google.com/youtube/answer/1311392
You should turn off any monetization on videos while you have an order in progress. However you can always turn it back on after an order is completed.
Leaving monetization or adsense on while an order is in progress may result in your order being cancelled without a refund, as well as having your YouTube account, monetization, and adsense banned.