personaly i think the name of your age is not the most important,. Important is the endresult . How it looks and feels to be there.
Before you start building the concept you have drawn,
first learn modelling in Blender or 3dmax. and learn it good.! Learn texturing.
Make some simple objects like vases, lamps tables, plants, rocks etc.
make a simple room , a cube will do fine.
place your abjects in it.
learn to export it.
visit your cube.
Once you have done that, go back to your concept and try to build it.
Ask your questions where you need help.
By the time you did this all,a proper name will come into your mind one day. Building is working day after day.
Its great to do, but its like piano playing.
You have to do excercices, day after day only to be able to perform your masterpiece as the crown of your work.