Help Installing expansion packs

I am completely new to all this first off. I have tried finding solutions to my questions on here but I'm getting exasperated trying to figure it all out. I have a legit copy of the base game, late night, and pets. I have dl all the expansion packs from this site off of piratebay.

1. Do I need to uninstall the expansion packs I already have and start over with the first expansion pack and go in order or can I leave ones I have on there?

2. Can someone please tell me step by step in the simplest terms how to add the expansion packs?

3. Do I need to apply the cracks or just use the ultimate fix at the end?

4. How do I make sure that my sims 3 base game is dl in the correct folder to start with?

5. Do I still have to mount the images and which files do I have to mount after extracting the rar files?

I am a complete newbie at this stuff so any help would be appreciated. Thanks!

//EDIT

Nevermind, I figured it out. The only one that didn't work was world adventures. Said I had an invalid file.

Hello,

For The Sims 3: World Adventures, you may skip all "# Crack" folders!
Other than that, here's everything else you need to know: https://games4theworld.forumotion.com/t1171-must-read-how-to-install-the-sims-3-correctly
DO NOT skip any steps and re-download both the manual patch and the Ultimate Fix!

Good luck and please let us know the final result!