Reddit mentions of Best Choice Products Wall Mounted Folding Wood Shower Seat Bench for Adults, Elderly,Bathtub, Bath w/Steel Frame

There are way to many variables that will impact your renovation. But a few common sense practices may be helpful:

If this is a tear-down-to-the-studs remodel, making sure that the framework is plumb, level, and in-square will go a long way towards making your life easier. Nothing sucks more than trying to adjust for wonky walls and floors.

If you have anything that is rotten, change it out now. This is not a job where "it looks good enough for now" will be fine. You want this to last for decades? You need a sound foundation to build out from.

This is just me. In almost all cases, a bathroom starts to fall apart because of water damage. So use products that resist water. I personally recommend pressure treated lumber (with the proper fasteners) for the studs. Use cement board or it's equivalent in the shower and around the tub. Mold resistant drywall everywhere else.

Tile and grout ARE NOT waterproof. Water resistant? Yes. Proof? No. So do yourself right, and use a waterproof membrane in the shower and around the tub. Kerdi-Schluter and Redgard are two good products. If you follow the manufacturer's recommendations, your renovation absolutely will not leak. Period. And that is a good thing.

The tile itself. Consider using large format tile, instead of the tiny 1" by 1" mosaic. The large stuff is easier to install, has far less grout lines, and is easier to keep clean.

For the floor tile, consider using ceramic or porcelain wood look tiles. It mimics a wood floor, with none of the headaches that you'd get from real wood in the bathroom. Or consider luxury vinyl tile or planks. Impervious to water, and easy to lay. Looks good, as well.

Light, heat, and ventilation. No one every said "my bathroom is too bright". So plan out the lighting in the early stages. Small can lights (3" or 4") don't take up much of the ceiling, but can provide tons of light where it is needed. They make trim for wet environments, so you can use them in the ceiling of the shower. Helps you find where all your body parts are :)

Install a vent fan, even if you have a window. The key to preventing mold and mildew is to control the humidity in that bathroom. A fan with a timer or humidity sensor is a useful addition to any reno.

If you want some cool stuff, you can install a heated floor for a relatively small amount. This one covers 16.7 square feet:

http://www.homedepot.com/p/IdealHeat-10-ft-x-20-in-110-Volt-Radiant-Floor-Heating-Mat-RSG-20-100-110M/203579013

you need to buy a manual or digital thermostat, as well. But it is only hundreds to install the system, not thousands.

Mount an electric towel warmer/rack on the wall. Your better half will thank you:

https://www.amazon.com/Electric-Towel-Warmer-Temperature-Timer/dp/B01BE1233U

Cover the walls with dedicated bathroom paint, that has a moldicide and mildewcide built-in. Should insure that your renovation stays bright and clean for years to come.

Don't know your age, but consider installing a fold down seat in the shower:

https://www.amazon.com/Best-Choice-Products-Shower-Folding/dp/B001W26NEC

Best of luck to you. Please consider taking pictures of your reno and posting them. We love stuff like this. Bet it'll look awesome when it is done.