I am 6ft Tall, 79KG, (about 175 lbs). As a general back story, i started going to the gym 2 and half years ago. The reason I started is because I was embarrassed by my physique as I was too skinny, about 5ft 10 and 58KG I think. Here's the deal, even though I have been training for 2 and half years, i'm still not satisfied - so after a month of training you should be NOT be evaluating your progress. A month is absolutely nothing when it comes to training and trying to put on size. Take it from me, I struggled so hard to put on size at first and used to be discouraged until I realised that food is absolutely key.
I can see you've just started so you need to know if you want to maximise your rate of growth you NEED to start eating more. A simple way to start is by literally counting your protein intake a day. Try to aim for 2 Grams of protein for every KG of bodyweight a day. Don't worry so much about tracking other macros (carbs and fats) right now because you're just starting out - you will get into it as you develop your motivation as well as your knowledge about how the body works and grows. If you really want to commit to it, use an online calculator with your measurements to find your BMR and do some research about what caloric intake you should be eating at for your size because everyone is different and you can track your macros everyday. But like I said, right now you just need to ensure you eat enough protein and enough calories in carbs and fats to ensure you have energy to grow.
Second most important thing is sleep. Sleep, sleep and more sleep. You will see minimal results if you compromise on sleep.
Lastly, is the work you put in at the gym. As you're starting out you need to focus on compound movements (exercises which involve a series of muscles). Develop your strength and allow your muscles to grow evenly. These are but by no means limited to - Bench Press, Military Shoulder Press, Squats, Deadlifts, Pullups (wide grip) and Tricep dips. Look up tutorial vids on to do perfect form on these exercises so you can get stronger correctly. Do reps at sets which you feel comfortable with and experiment -
some people build with lower reps heavier weights and some with higher reps and lighter weight - only you will be able to learn what your body needs.
Other than that just be patient man, the gains will come. Focus hard right now and stop worrying about how you look. You have to commit to this, it won't happen over night. The belly will go as you use more and more energy to build that muscle (but be careful you might see it get bigger if you are over eating which is what happened to me but I didn't care because the muscle and strength gains I attained were more than worth the extra body fat). Maybe in 3 months evaluate yourself again and you will see a big difference - trust me. Best of luck man I wish you the best. Remember winter is BULKING SEASON so eat like a horse!
Also, if you're looking broaden your knowledge on fitness and bodybuilding look up a guy called Mike Mathews on YouTube - his simple but effective way of relaying his tried and tested knowledge about nutrition and working out will really help you out.
And also - don't start taking protein powders yet either because your body will not need it yet. You will either A) piss it out or B) get bloated and store the extra protein as fat. Stick to real food for your daily protein until you feel ready to start taking whey protein.