Here's the first video I made during my lunch break, but I hope it will help you to create the first basic room.
Part 1 - Creating a simple room:
Part 2 - Making windows, moving the spawn, creating your own light:
Part 3 - Expanding a room, creating custom funiture + position markers, creating a small beach.
Part 3.5 - Moving funiture, window-graphic bug.
Part 4 - Creating a beach, grouping objects, using effects.
Part 5 - Detailed tutorial for creating a room, how to easily create small objects
Part 6 - Difference between local and global axis.