We need to see your space and stairwelll Post those pics here in a comment do not start another post. Yes you will need to ask for a drawing, A good finish carpenter should be able to handle this job. Price is not something we can really guess you will need to check out at least 2 and better 3 finishing people and get quotes . I do not like this type of trim if only done in one palce so are you palnning some more of this in amaybe a DR otr hallway? It does not need to be exactly the smae size but IMO the same material and size of lumber . So you could do a chair rail in a DR for instance.So post he pics here and maybe one pic of your LR so we gt a feel for your style .

First, I would determine the project design - where does the paneling begin and end? How high does it go? If it goes to the ceiling is there a need to re-install crown? One way to start is to collect as many pictures of these projects as possible and then note aspects that you like or dislike. Do you like more paneling segments or less? Thicker or thinner segments? Do you want any mouldings in the inner panel?

I think that any decent woodworking organization should be able to make a scale sketch possibly a simple rendering. You can do the same thing using sketchup or home designer, this is a valuable skill for future projects.

For trim work, I would get several quotes. Ask questions about how they are going to assemble and finish and take good notes. You'll surprised at how techniques vary and learn alot about how they work and price their jobs. One way to determine a fair price is to ask how many hours it is going to take.

I've done several of these "wainscoting" projects. Done well, they involve pre-asssembling the segments, the joints are assembled with glue and pocket screws so the joint is perfect. Don't allow a carpenter to just nail or glue 1x lumber to the wall. Once the segments are pre-assembled the outside pieces may need to be scribed to inside corners. Please have a look at the four wainscoting videos on Gary Katz youtube site.

You are asking for design, build, and rendering. That cuts out 90% of folks. But, figure 10-14K, if you want it done correctly and well, by a finish carpenter or cabinet maker, in paint grade MDF. They may not have those rendering skills. If you want an even higher end raised panel judges panel look, triple that. For real stained wood, double again. If you just want some cheap screen molding slapped up, then DIY it. Handymen find the math needed to do that challenging. They absolutely cannot render it.

We won't be able to give you an estimate because labor costs vary tremendously by region. I would simply get bids from three different contractors for labor, materials, and painting so you can see what you're dealing with.

It won't be inexpensive, that much I know.

Board and batten Wainscoting

You can use a carpenter or a handyman with the right tools.