Beginner strength trainee

Hey everyone. I am fairly new to the whole strength training program (female, 22, 57kg) and was wondering if anyone has any insights on how to go about it. I have been incorporating it in my gym routine with cardio and just really like it (I work out everyday for about 1-1.5, doing a bit of both every time). How do rest days work? What about nutrition? I eat at a deficit now as my goal is 55 kg (so about 1200 calories and sometimes a bit less) but I want to build muscle. Finally, any routine suggestions? Really looking forward to all of your suggestions!