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.

Are you interested in adding something besides beige? The look appears bland to me. I love color and might have some ideas if you are looking to add something else.

How can I do that @akhilesh joshi How can I explore and decorate like that

Not sure where you live, but there are some great finds on FB marketplace for furnishings in some areas. Leery of bedbugs on upholstered furniture, but I guess there are ways to make sure you're not getting them. Ikea is a good inexpensive option and people seem to be really happy with their slipcovered pieces. I would also get a nice inexpensive rug. There are so many online sites with great choices and a few you can use their visualizer to place the rug in your room to see how it will look. I'd probably put the most money in a comfortable reading chair, like a recliner. So many of them these days don't look like recliners and are very comfy. Not sure why faux wood blinds or if you mean venetian style/mini blinds or roll down shades? Whatever you get, I would make sure they are opaque at night (solar shades are not opaque), since you will be a woman alone. Dogs are good, but I'd want to be sure no one can see in from outside. I hope you'll post as you find and furnish your little house, It looks very sweet and perfect for your purposes. So much nicer to spend time there than in a car for hours each day.