You want to avoid ceiling speakers at all costs for anything but Atmos speakers.

The rest should be in-wall speakers, or floor standing, or on-wall speakers. This is because the ceiling is the wrong place for audio to be coming from.

Ideally, you could put 3 identical in-wall speakers across the front of the room, behind an acoustically transparent screen, then put surround and rear speakers in the walls at the proper height.

I will say, that hiring someone to help get things setup isn't a bad way to go if you are unsure of what you are doing.

You will have to consider that HDMI DID NOT EXIST 20 years ago, and it has been changed multiple times over the years. I will say, your electrician is unlikely to know ANYTHING about HDMI variants, and what HDMI 2.0 cable will work or anything else. So, you will want to run CONDUIT - at least 1.25" or larger, from your equipment location to the projector location so you can change the HDMI cable out in the future.

For a projector, it is all dependent on the room itself. If your intent is to paint the room dark, like a home theater, and have curtains over any windows that block light nearly completely, and you will paint the ceiling dark and use dark carpet, then spending more on a better quality projector is worth it.

The Epson 3200 and 3800 models are good entry level models. Their 5050 is solid as well. If I were to spend the money and have a good enough room to support the 5050, I likely would spend $1,000 more and get a JVC DLA-X790R instead. The black levels are that much better and image quality has a significant boost over the rest near that price.

If this room is important to you, do your homework and ask questions and accept that electricians can run wiring, but are clueless (CLUELESS!) almost always when it actually comes to proper setup of a home theater. Builders are just as bad. They just don't know what they are doing and over and over and over again over the years I've seen people get screwed over by incompetent builders/electricians when it comes to their home theater.

You will want to come up with a budget for things. Projectors range from about $1,000 to over $5,000 and you get what you pay for.
Speakers and surround sound systems are the same way.

A good question for an electrician is to ask what gauge speaker cable he will be using.

If he doesn't know, or answers with anything less than 14 gauge (16, 18, or 20 gauge, etc. is smaller and inappropriate), then I would be darn sure you do your homework before you close the walls up for drywall.

As far as space goes, you should look at the recliners you purchased and how much room they actually take up. Many take nearly 6 feet when in the reclined position. So, that's a total of 12 feet, which may put your front row right up against the screen. I might opt for at least a bit more depth. You will want to be sure you have enough room to have a way to that second row as well. So, I'm not sure if the room is quite large enough to support 8 recliners. This is one you will have to draw out with pen and paper to be sure of.

For images, please go ahead and put them on a image hosting website, then link to them from your response, that way people will be able to see them easily.