I would always start by kitting out the room with high-quality ironmongery products.
This will give you a strong and sturdy platform in which you can work from.
Once you have installed door handles, hinges and any locking mechanisms, you will then be able to create a consistent theme throughout the room.
We have over 3,000 ironmongery products available at https://ironmongeryexperts.co.uk/
If you would like further assistance, feel free to contact me directly - firstname.lastname@example.org