When should I get the lease signed?

[Jordan Epping]

I listed my house for rent yesterday, and within a couple hours, I showed/screened and accepted a tenant. She is scheduled to move in on August 1st. Ive had about 50 people reach out, so I am a little hesitant to just take her word for it that she will move in, so when should I have her sign the lease?  Do we sign the lease soon and just make it active as of August 1, or do I wait the 2 weeks and hope she doesnt change her mind?  I am located in Wisconsin, if that matters at all.  Looking for any advice and recommendations from the community!

Thanks