Question PSU and CASE upgrade, will these components fit with the rest?

[FamilyFriendly101]

So I want to change my case since its a really old one and thats what people suggested in my previous thread in which I told people that during the summer I literally need to keep my case's side panel removed. My current case is a Myria MY8700 that literally can't be bought anymore and only takes 2 fans, though I can actually install only one.

I want to buy another case and another PSU since I currently have an njoy one which I only hear bad things about, and a 2x8gb ram kit .

These are my components:
-myria case
-r5 3600
-rx 6600
-12gb ram(dont ask)
-the njoy psu ,650W I believe
-1tb hdd
-1tb ssd
-an MSI A520M-A PRO mobo

I'd like to buy this case and psu:
https://www.pcgarage.ro/carcase/alphagear/runesmith-black/
and a

Corsair RM650, 80+ Gold, 650W​

I just want to know if the components I have can fit into this case along with the ones that I already own.
ALSO, somebody told me if I get a case with fans that have leds I wont be able to also plug the leds is because the mobo wont have a connection for them ,is that true?