This isn't the time to be decorating the tank so forget the rotala, microswords and crypts. These dont do anything in the near term other than look pretty.
The plants you ought to be "using" are fast growers that absorb and neutralize any parameters spikes. get a ton of floaters, anacharis and even hornwort. These actually benefit the tank and are not there for aesthetics.
also your ammonia, nitrate and nitrides will remain at 0 once the tank is cycled. If you cycled the tank with a single betta, you have quite a road ahead since the tank really isnt capable of handling more load than what bacteria could survive off the little bettas ammonia waste.
Concider getting bacteria in the bottle. Ive received suggestions to use Dr Tim's products to accelerate cycling. The 16 oz bottle is pretty reasonably priced. Read the link below for more details. http://www.drsfostersmith.com/produc...m?pcatid=25252
BTW, If these shrimp are arriving monday, you shouldn't be ordering anything online as it will never make it in time. Get everything locally and immediately. Anyone that suggests ordering online doesn't appreciate the urgency of your situation.
Also, if you've never kept shrimp in a large tank before, extra attention is needed to ensure that the biofilm is developed and that feedings are done in multiple locations... Whatever you saved upfront with the shrimp will be paid out in spades prepping the tank. Boy, you surely set yourself up to a boat load of work this weekend, i kid you not. If you fail to provide the proper environment, you will see them die off every few days, with the longest surviving one live about 1.5 to 2 months... seen this happen too many times in this hobby. I tried helping coworkers who were too proud, saying everything was fine, all their shrimp are feeding only to see the crs/cbs dwindle to zero by the second month. You are ahead of the curve (somewhat) by asking for help. None of the details ive provided is candy coated so you shouldnt be surprised when you start working on this the next few days.
Just pm me if you need more help on specifics.