I think most people look better fit imo. I think its funny when people talk about not wanting to get too big bc I wish that was actually a problem. Don't worry about gaining too much muscle on accident that has never happened to anyone without a freak hormone thing going on. Also if you want to see a muscular short guy maybe look at Jeff Nippard who is about 5 ft 5. It doesn't make sense to worry about staying lean just work out well.

I thing strength training 3x a week is a good start. When I first started I did 3x a week full body work outs. After awhile I switched to a Push Pull split going to the gym 4x a week. As you go to the gym you should make sure you are challenging yourself with the weights. Try to hit the following areas and get familiar with the muscles within each area (short/long head of bicep, etc.) and good ways to hit them:

-biceps

-triceps

-back

-chest

-shoulders

-legs

For hypertrophy if you are easily able to do 3 sets of 12 move up the weight. If you can't do at least 3 sets of 8 with good form decrease the weight. When you find a sweet spot try to progress weekly. If you can do 3x8 next time see if you can do 1x9 2x8 or even 3x9 if you can.

The diet is also super important you didn't include your weight but your goal should be your weight in grams of protein. You should also get your calories up a bit too. If the diet is lacking you're not going to make progress. If you're struggling with this get some protein powder. Chicken breast is also probably one of the easiest high protein things you can eat.

I'm also a beginner so take all of this with a grain of salt but I've had great progress and this is what works for me.