Noticed this yellow burn on dwarfs first leaves. W...

Hi there @BalconyGorillaUK Those are called cotyledon leaves and will eventually drop off
Absolutely nothing to worry about.
Regarding the bigger pots a lot of people say you shouldn't transplant autos etc and that you should grow them from start to finish in the one large pot. If you want to go into the bigger bags I would do it now to avoid any stress
later on. Do it in the late afternoon so it has the night to recover.
Dont overwater the big pots as they will take longer to dry out between waterings.
I have grown this strain before and have another diary of it going now so any other questions feel free to pm me