Everytime the booker decided to sign you up, be sure to check out their clause. By default they will give you good clause but sometimes they give you a bad clause. Here's the list of good and bad clauses.

+ Creative Control: You CAN refuse any changes that your booker suggest to you. This is a VERY good clause that everyone needs to get it since the booker will mess up your creation and your moves. Successfully unionise against the booker will grant you this clause as well. Ps. Thanks to Dave Monggose for the correction.

+ Iron Clad: You CANNOT be terminated prematurely by your booker, kinda useful when you encounter with pay cut event which there's a chance that they will kick you out from their company if you refuse to cut your payment. Not only that, you also being prevented to get fired if you failed the task that the booker gave to you! (So screw you for wanted me to lose just because I have win streak!) Winning the court case will change your current clause into this Clause. Ps. Thanks to snakelegend and Dave Monggose for the correction.

+ Win Bonus: The Pay-Per-View bonus now applies in every matches as long as you win the match but if you lose, you'll paid less.

+ Downside Guarantee: Every week, you'll paid no matter what even you're free. You didn't get paid if you injured.

+ Health Insurance: You'll get paid if you injured very useful if you still being fragile but useless if you already buffed up.

+ Favoured Nations: Your salary would be matched with the highest salary member. (Tip: If you be sure to check out the roster before decided to pick this clause to check which one has the highest payment.) Ps. Thanks to HardscopeHezi for the correction.

+ Nepotism: Partner and/or Manager in your side will joining as well with the same term as you. Story Friend and/or Real Life Friend will also joining as well. (Citation Needed!)

+ Title Push: The booker will guarantee you to be booked for title shots. A good and quick way to earn your achievements quickly.

+ Part Time: You'll less being booked for the match so you'll have plenty of time for training.

- Incentive: You ONLY get paid if you win the match. Losers didn't get paid so be careful!

- Enhancement Talent: You ONLY get paid if you lose the match. This is the easiest way to earn money by just chickening out from the match without caring about your popularity/attitude.

- Not Compete: You cannot be recruited by the other promotions until your current contract expires!

- No Creative Control: You CANNOT refuse any changes that the booker provided for you.

- Overtime: You cannot refuse your booker's request to match additional matches, being a refree and being a commentator. *

- Immediate Start: You'll start your first match immedietly without delay for preparation. *

* Added in 1.22 Update

That's all for now. There would be any updates if I see any errors or I missing something.

Update 1: Added some corrections about Clause descriptions

Update 2: Corrected Win Bonus Clause benefits.