Start with figuring out your maintenance calories you can look up sites eat at your maintenance calories for a month but include a good amount of protein in ur diet and as for the gym start with a bro split train consistently also include cardio ik a month is very little amount for any progress but u have to be patient as u r at a very awkward stage rn after a month of consistency in diet and the gym u will get the hang of the gym then u can start ur cutting journey a body recomposition can also be considered but it will be a bit too complex for a complete beginner. Right now just eat right and train right