Please, those who have already done wholesale, answer whether the chain of actions that WHOLESALER should perform is correct or not, maybe there is no need to do some steps or actions at all, please explain me those who have already done wholesale, thank you very much.

I am wondering if anyone has ever taken legal action against property managers, and if they think we have a potential case? 

Put a lien on the property(s) they own, this is needed by some court action (i.e. lawsuit in civil/criminal court) 

I have listened to the BiggerPockets podcast for sometime now but have never taken any action, hoping to change that very soon.

Remember, confidence grows with each step, so take action and keep moving forward!

Clogged toilets, sinks, etc.

There is no class action suit at this point.

I am getting started in real estate investing soon, and I want to plan for the best course of action.

It's simply factual:  you violated the lease by smoking, stop it, remove the resulting odor and that a repeat action could result in eviction and loss of security deposit.  

Hey Josh, Welcome to the community and congrats for starting to take action early on.