WordPress expert for customization in Woocommerce

I have existing WordPress website, where I want to make these customizations: 1. Adding custom fields on checkout page (conditional) 2. Add ability for the END USERS to EDIT their ORDER when STATUS == PENDING 3. User can confirm the order. Status will be changed to PROCESSING 4. Cancel ORDER - penalty fee with Partial Payment Refund If you are pro in WordPress, please apply. Thanks in advance!