Sims on a mac wineskin tutorial

Hello...
So I tried to follow the tutorial but I'm afraid I have some questions. 

1. If I want to install the Sims 4 from scratch, exactly how many torrents do I need to download? I guessed at the two from the G4TW downloads page plus the top one from the ultimate fix page. Do I need to separately download and install expansion pack torrents every time they are made available?

2. I got the base game working successfully when following but once I quit out of it I couldn't tell how to relaunch it again later and the tutorial didn't say. How do I do this?

3. Two files were saved onto my desktop when I ran the base game, TheSims4.lnk and TheSims4.desktop. What are these and can they be deleted or tidied somewhere else? 

4. The tutorial talks about adding the DLCs and addons, and says if you can't find a setup.exe (I couldn't) in your downloaded files, you should copy and paste the content from those folders into the base game folders. When I do this, I sometimes get asked if I want to replace the files, and sometimes if I want to merge them. I said no to replace but yes to merge but I have no idea if that's really right. 

5. I now have no idea how to get back to the game. When I click on the 'wineskin' I made with the earlier install, it runs for a few seconds then closes, and nothing happens. 

Would appreciate some clarification from anyone willing. Thank you....

I appreciate you posting this tutorial but I was trying to run it through Wineskin on my Mac and that's what I need help with.

Hi again
I gave up trying to get this to work on my Mac and attempted to follow your tutorial. thanks for explaining the process so clearly.
unfortunately once I'd gone through all the steps I got the following error:

are you able to help?
thank you in advance.