It is hard to give you correct recipe without knowledge who is your counterparty.
But if we are talking about general trading session of abstract sell side, you may request list of currently open orders(which will usually be returned as list of ExecutionReports) with OrderMassStatusRequest. OrderStatusRequest can be used to request status for particular order.
If you are in DropCopy session, in most of the cases ExecutionReports will be streamed to you automatically.
I strongly suggest you to follow Grant Birchmeier recommendation and start with documentation. Or you can disclose your counterparty name and I will tell you what message to use(if it available)