I would do two three seat beige sofas and two brown fabric or brown leather armchairs with their backs to the sliding doors. Go for a red and brown color palate to work with the beige walls and pine floors. I attached a 3D rendering down below

I would get a much larger area rug. Centered on the fireplace.

two sofas ON the rug facing each other. Not too close to the fireplace... looks like you have plenty of room.

the step side you could add a sofa table for decor interest from the adjacent room. Create a single reading area to the Right of the Fireplace... a comfy club chair with a floor lamp.

Foe wall decor ---Add a large piece of Art on the wall and make it the focal point to anchor a room. A large piece of Art can really bring in a wave of deftness and add more color and life to your room. It acts as a style to your room.

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You might look at moving the TV to under the window on the right of the fireplace over a long low console and then place a piece of art over the fireplace.

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Please help me to suggest the size of the sofa if I use 2 sofa