I am finishing my basement. I have a lavatory, toilet and shower roughed in. I have a capped vent line above this area. I am going to vent from the lavatory and have the shower and toilet wet vented from this.

My question is do I just connect a wye to the stub out and run it to the p trap and the other straight up to the vent line? Is it OK to use 90's on the vent pipe?

Thanks for your help