For running a business with employes and the whole shebangs. Which hacks/fixes would you say are essential? I only played the biz angle of that expansion once. And I hired an employee. Once. Then I had to fire her because she was destroying my Sims business 

Now I want to try again but I realise I can NOT do it without some neat hack fixes.
I have only installed 
nooffercheap and 
noplayableshoppers by Pescado. I do plan on getting some of James' fixes: 
http://www.simwardrobe.com/ but I can't decide on which ones 

And another question...if I were to hire a playable Sim that already has a job, will the game allow it to happen and what happens to the job he/she has? And does a playable Sim get the pay he/she gets from the store added to his/her funds?