Hi Ender:
FSSC is pretty simple really. Here's how it works:
Open the program and and click "Edit" and "Scenery Properties".
Fill in "Credits", "Aiports" and "Dimensions".
At the bottom left, you can see the co-ords of your cursor.
Right click on the spot you want your macro to be.
Choose "New 3D Object"/"Macro" and find the path to your .api files and choose one.
Right click the macro and you can adjust the heading etc.
When your done, click "File" and "Save As" (whatever).
Click "File" and "Export Scenery Wizard".
Make "Base Location" your destination for the bgl file and click OK.
Don't forget you still have to activate the scenery in the sim.
It's a good idea to allow the "Tip of the Day" at startup, you can learn alot that way.