Motherboard should drop right into place really. The screw holes will line up when you move it around on the mounting plate. Just make sure the processor end of the board is up by the PSU.
Fans are simple to mount, because the case gives you mounting locations. You can't miss them. Make sure they're facing the right way when you mount them!
The PSU will only screw in one way. You'll know what's right when you get that thing up in the top-back of the case.
I like this beginner case. Later, if you want to add front USB ports, you can get one of the little inserts that fills up a 3.5" floppy slot! I got one for my lady friend. But, here's the case link.
Good luck, and if you have any more questions, post up.
on edit: there are front USB ports, so don't sweat it.