If you are beginner and don't want to spend a lot time in gym, search for Fierce 5, starting strength. Both are beginner routine concentrating on compound movement. Both are full body routine so you only need to go gym 3 times per week.

And most importantly, it is much more effective than your own designed routine. Take this advice and you will thanks me in no time =)

Of course, you always need to make sure your diet is good regardless of your aim.

I'm sure you have little to no knowledge on lifting. Get the advice from someone and run a fullbody routine as I suggested previously. You expect to gain how much muscle by doing curl in 1 session? There are bunch of curler(curl every single session in gym) in my gym and they are the same after 1 year.

So you expect to press the same weight for your chest and shoulder? That's funny when you don't follow a routine. You simply choose a weight and end up you keep repeating the same weight as you won't track and progress properly.

As for your diet, some is doing different calorie intake for workout and non-workout day. But definitely not simply eat during your non-workout day. You should track every day if you really want to see result.

Yes I went through as beginner too and I learn from somebody better. Split is completely fine but I'm sure you looking for optimal result right? The problem with split is you will be exercising each muscle group once per week. Compared to fullbody which target most of your major muscle group thrice per week. 1 time compared to 3 times. During beginner stage, your body doesn't need long recover period. Hence, frequency is more important than volume. It means that you just need to do about 3-4 sets for each muscle each workout day. And you hit the same muscles as frequent as possible and there's come fullbody routine.

And about choosing weight, it is suggested to use barbell instead of dumbbell due to the increment weight. For dumbbell, you need to jump from 7.5kg per hand to 10kg per hand and it means 5kg increment. Compared to barbell which has 2.5kg increment.It is easier to progress with barbell. And with some legit routine, you just pick a very light weight and you will progress to your max one day later. If you insist of doing your own routine and own weight progression, I'm sure you gonna use not more than 15kg for the same exercise that using 7.5kg now after 1 year as you don't know how to progress effectively.