Pull up form check

Hello I have never been able to do pullups before. Couldnt even do pushups once. Well recently i did 2 pullups (and a weird third that prob doesnt count) which is huge for me even though they probably werent that well executed. Since im new to this exercise i would like some help when it comes to proper form. I noticed myself that i pull a bit unevenly (i have uneven shoulders so thats prob why -weak left side). I also know that this def isnt strict form based on my leg position haha. Somebody also said that you should do chest to bar instead of just getting the head over the bar? Then some said that its just two different variations. One being more effective ofc but not making the other wrong. Any advice on my shoulder movement or anything else? I really wanna improove my technique as well as my strength.

the link is this one (sorry for the "?" ahha but that was the only way i could post the link. Just delete them when using the link )

https:?//you?tu.be?/Y3a?EX4yEY1k

by Rebecca2853 via Bodybuilding.com Forums - Female Bodybuilding