new job - need advice!

Beatrice
Hey all! So I've been offered a new job, and I told them I would think it over during the weekend and let them know on Monday. 
I want to take the job, however I have more questions for the hiring manager. Does it make sense if I email them tomorrow and ask, or will it sound like I'm unsure? Will they be pissed off?
Ps I want to ask these questions before accepting. 
Please give me advice 🙌🏻🙏🏻