1. What size and what kind of tent should i choose?

 To figure out the most suitable measurement for your case, we need below information:

-how many people you want to fit in the tent, is there anything else (like tablem stage,chair,ect.)

-the usage of the tent (what kind of event, day or night) 

-located ( available area measurement,  indoor or outdoor)

- your budget, we can recommand the suitable material, design and size according to this request)

2.The material can be waterproof since it will be using outdoor

-yes, the material is water proof and also fire resitant

-no, the material is not harmful, it is environmental protection material