The first screen you will see contains a figure standing next to lines which represent the X Y and Z axis. On the left and right are tool boxes, you will mostly use the left panel for constructing your designs. The panel at the bottom contains tips and a measurements window.
The version of Sketchup you are using is online, the full version is a down load. Most of the tutorials are for the full version. Below are some links to tutorials for your version.
Watch the video on the left. Take your time it covers all the basics needed to create a simple build. There is no sound so I have done the design slowly. Pause the video whenever you need.It might take several attempts.
It is important to make frequent saves of your work, if you wait untill it finished you take the chance that it might not save or you could loose it becuase of a computer crash. It is also a good idea to save your work incrementally, this means adding a number to the end of your file. Do this in a sequence e.g. house1, house2, house3 etc. It means that if anything goes wrong or you change your mind about a design it is possible to load a previous design.
Unless you have a 3D printer you will not need this stage but it is useful to know and something we will cover in class. Open your model in the printer software that came with your machine.Position and scale it to your preferences. You now need to decide on the resolution of the print, higher or hyper will give you a better print but take longer, while low is much faster but less detailed. This print will take nine hours thirtytwo minutes. Both settings use about the same amount of filament. Send the file to your printer, it will do this in the form of Gcode which is understood by most machines of this type.