Hello,
I have only had a brief experience with the MMO kit and that was when working for a client. However i am aware how they store info on the server. Because the suite system uses Datatables and ID’s it shouldn’t be hard to connect.
Setup the system as described in the documentation video, then connect your player name and ID in the inputs.
If you really want to include Inventory and gold/cash into the third party database that shouldn’t be too hard if you have experience working with vaREST. However explaining this in extreme detail without having the MMO kit myself would be extremely hard.