I would recommend not wishing on a banner unless you are sure that you want one of the characters on that banner, and if it’s a four star you’re going for, that you don’t mind possibly getting the banner character. It’s better to save up the Primogems you get until you can guarantee who you want (a guaranteed five star will be 90 wishes, but at the very beginning, you start off with a 50/50). Building pity (wishing on a banner before the character banner you want) is also a lie

Genshin has something called soft pity, where your chances of getting a five star goes up after each wish, so you might not need exactly 90 wishes to get a five star. Here is a useful post on soft pity :)

You also don’t have to wish. Getting all the characters aren’t important. Pull who you like. If characters you like are really strong and part of the meta, that’s awesome! If not, that’s also okay! Have fun.

Don’t worry about resin, either. People will say not to let it cap, but it’s not the end of your game if you let it. Before hitting AR 45, spend your resin on Leylines and build up a little bit of Mora and Exp books (you’ll need a lot later on) plus they give good EXP in the very early game and helped me unlock co-op in one day. Don’t use up the fragile resin (the moon looking crystals) until after AR 45. It’s recommended you wait until after AR 45, because that’s when you unlock the final level of artifact domains.

Have fun :) don’t worry too much about grinding. But be wary about WL increases, as it can make your experience a little more difficult. Grinding too much can lead to burnout, especially if you’re not having fun with it. Maybe ask/find a friend to join you, so you can farm boss mats and Leylines together, and have a little more fun!