Maybe you aren't as creative as you would like to be, but you probably know what you like and what you don't like. So that's why you should get a bunch of magazines and on-line pictures to start seeing what speaks to you and what doesn't. We now know that you don't want orange. What other colors don't you want/what colors do you love? Do you have a Calico Corners or JoAnn's nearby? Try browsing the fabrics and figure out what and colors and patterns you like: stripes/plaids/polkadots/floral? This is where you can start, and then we can work from there.

I love the clean, uncluttered look of your home and you've made some great furniture choices. My first thought, though, is that I would try to rework the sofa/sectional placement. It really is unwelcoming looking to me to have the back where it is facing a wall, when it could be oriented to look into the room and out the windows. It seems like if it were placed in the corner under the stairs that it would feel open and invite you to come in and sit. I'd hate to be cooking in the kitchen and have the family or guests with their backs to me. If you are having a TV in another room close by, do you need one in that room, too? If, so placing a 70" unit will probably only work as you have it. But, to me, it's not going to look like a living room but more like a movie theater, which is fine if that's what you're going for. It seems like it won't be a cozy conversation area, though. I might actually flip the rooms and put the dining room where you have the sofa now. I was looking at lights used with dining rooms and ghost chairs and saw this, maybe would work in the living room? Kind of fun. don't know if it would look as good without the colored walls though. And I thought something like these were interesting to consider for over your table:

Measure out your space to see how much usable space you will have for the furnishings. A sectional might or might not be a good option for you. As you shop gather dimensions of pieces you like then use tape and place it on the floor so you can see how it will look space wise. As mentioned above pick your focal point. Your fireplace is so nice it seems that you should work around that.

"'Which one do you like best?" Honestly, I like the single 5 seater with the two swivel chairs the most because it is open and easy to access. You can always pull chairs in from the dining room table if you need more seating for folks. But the single couch with the two chairs is really nice, balanced and all you will need for your daily use. I do like the couch with the chaise as well for daily use but then I like being able to put my feet up or even recline in the evening while watching TV.