Alright, got the game and yeah, I like it, but I have a real problem that makes me not want to play

In The Sims 2, when you were on a lot, if you moved your mouse to the top of the screen you could go forwards, and the same for backwards by moving your mouse to the bottom and exactly the same with sideways.

But that doesn't seem to work The Sims 3. Is there a way I can fix or better this? Because I can't get to or see the back of my house and it's irritating me x]

It's ok for it to have a ! by it, that just means the game is telling you it's a global mod.  Just make sure the allow custom content is ticked, and say OK

Are you sure you have the right version of the mod for seasons?  EP3 was before Seasons.