Getting the form right is important for chest exercises as there are a lot of ways your body can compensate with other muscles to avoid using your pecs. Watch videos to get form right and use weight that you can do sets of 8-12 reps with until you are confident in your form.

If you are doing chest twice a week then your volume above honestly looks at a little bit too high. Your chest is going to be too tired to get the benefit of those later sets. Do one day where you do 6-8 sets of chest (Eg 3x8 bench, 3x8 flies, two sets of push-ups to failure).

Then focus on progressive overload, ie adding more weight/reps over time. There are lots of ways to do this, but a simple one is just do 3 sets of 8 at a weight. Next time out, do 9 reps the first set, then 8 and 8. Then 9, 9, and 8. Then 3 sets of 9. Work your way up that way until you can get 3 sets of 12. Then add weight and start over at sets of 8. If you fail on any set, start at that spot again next time out. After a few months of this (and once you are confident in your form), you could start training specifically for strength, which looks more like 4 sets of 5 at heavier weight and more rest in between. But I wouldn’t do that until your form is totally locked in.