if your struggling with how to nail things down it may help to make a rough script if you dont already have one to help make clear the scenes you're trying to depict, the character dialogue or what action a character is taking in a given moment. you can even do this alongside rough thumbnails or little stick man comics if that helps to make that vision clearer
as for quality, if its your first attempt at a comic, you dont really need to worry about it and should instead just put your focus to finishing the thing or at least organizing a few finished chapters than tarrying over whether it looks good coz you'll simply improve as you progress (it's just the nature of these things)
other than that it's like folks have said, be patient with yourself, take your time and dont overthink just create and try to have fun with the process
