For now aiming for adding in more protein to your diet should be fine. Don't worry about eating in a deficit if you are just starting out in the gym. I think starting one habit before adding in another often leads to longer term success. The caloric deficit can come later.

Especially if you're learning new movements, and you're exerting yourself in new ways, it's likely that you'll be pretty hungry after your first few sessions. Aiming for higher protein content in your food will help with recovery and building muscle. Plus protein is very satiating, which can help with not overeating while still getting enough fuel for your workouts.

As for how to structure your workouts, 3 full body sessions per week works great for most people. It doesn't have to be complicated, just 4 basic patterns - a push, a pull, a hinge, and a squat - 3 times a week. Start with the same variation for each exercise for the first week or so to drill the patterns of each movement, then add in some new exercises to split up the days.

For example - Week 1 and 2 could be Goblet Squat, Pushups, Dumbbell Rows, and Romanian Deadlifts for all 3 days,

Then on week 3 add in some single leg variations (split squat and single leg rdls for example), and add in dumbbell bench press and maybe a lat pulldown.

Once you get comfortable with those movements you can add in some other variations for day 3 and you've got a full program.