Visit a local paint store or three and find some colors you like.

For warm white walls, I like BM Ballet White OC-9. For (slightly brighter than Ballet White) trim, I like it paired with BM Swiss Coffee.

You can consider painting the wood trim the same color as the walls (using a different sheen).

I've used eggshell sheen on the walls and semi-gloss sheen on the trim.

From what direction does the dominant light come?

Without that information, my suggestion would be Decorator's White trim, satin finish, Decorator's White for ceiling, flat finish, and for the walls, B.M. Linen White. Gorgeous combo. Carry around a paint chip of B.M. Muslin for the sofa color.

Good suggestions so far - we have recently done BM navajo white with bm simply white trim - do you know of kylie m?

https://www.kylieminteriors.ca/the-8-best-whole-home-warm-neutral-paint-colors/

Do you want to paint every room in the house the same color? The color of your furniture and floors should have a large influence on what you choose. To help us help you, post some pictures of the rooms you're planning on painting. One of my friends has painted all three of the houses she's owned over the years BM White Dove (walls and trim). It's a color that goes with pretty much everything. In SW, look at Pure White for trim.

While BM Decorator's White was recommended by another commenter, I dislike it, which just serves to remind us that everyone does not like the same thing. So you will need to consider a wide range of whites and off whites to start, then move on to Samplize samples (which are larger than chips) in the finalists. When you don't know where to start, I recommend looking at your preferred manufacturer's most popular colors, which they all show on their sites. There is a reason they're popular.

I painted every room in my house 5-6 years ago because I had moved, and a combination I used in several rooms was BM Soft Chamois on the walls with Simply White trim. Look at Pale Oak or Edgecomb Gray if you want more contrast with the trim (EG is not very gray).

I used BM White Dove on the walls and BM Chantilly Lace on the trim/crown/doors/cabinets.

I started out with BM Winds Breath on the walls (similar to the BM Soft Chamois mentioned above), but found it too "tan" and "dark" for the look I wanted, so I repainted in the BM White Dove