There is no right or wrong way. Do as you want.
For us everything is from Santa when they are little, as they have gotten older they realised some gifts came from us, mainly due to them actually looking at the gift tags and realising it said from M&D. Usually any family gifts are given separately, but on occasions where we have put them under the tree, mainly during covid, we obviously say who they are from.
List rules are 2 Santa gifts and now 2 gifts from us. They also get to put a backup Santa item in case Santa can’t get their first choice. Once lists are posted they can’t change them, not that it always works, my 5yo has done a “list” at school with pictures from Smyths catalogue, which she is convinced Santa will bring everything from it, so I’m having some difficult conversations with her right now. The earlier they get the lists in the better chance Santa can get what they want. I like to have them done by September so I’m not hunting around for that one gift they really want last minute. I’ve also been known to heavily influence their lists to include what I’ve already bought 😁
Everything else they get on top of their lists is just a bonus.
We have always told them Santa works with parents and he makes sure parents are happy with what they have asked for so he’s not going to bring a phone if the parents have rules on phones. My DDs wanted ride on toys when they were little but we had no room so we told Santa not to bring them. This helps manage their expectations.
I never had stockings or sacks as a child so really didn’t know what to put in or do with them. Sacks were introduced last year as my DDs wanted them, but I actually don’t like them as I like to spread all the gifts under the tree to make it look BIG. Stockings for us are mainly chocolates.