The first step would be understanding if you want it for a practical or aesthetic reason. Many family homes will choose a closed staircase for safety reasons, don't want little legs getting trapped or swinging off the banister poles.
If you are looking at it entirely from a design aspect then I can help you put together an Ideabook here on Houzz; looking at other peoples work will help you decide what would suit your own home.
Luckily, I can happily tell you that we have a tool that is specifically designed to help you design your closed bespoke staircase from scratch and provide an instant quote, you can begin designing your staircase here:
Vyou Home improvements
StairBox
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