Hi there JR and welcome to the forum

,
The 19 L from a 32 L pot is do-able but will require a bit of juggling. When you decide on a recipe, post it up here and we'll get you sorted out.
1. Maybe have a look at
this thread for some ideas on your BIAB bag. You can also buy them from various places online. A google for "BIAB bag" should come up with some sources. Make sure the material is polyester and has a thread count of 30-40 threads per cm.
2. A false bottom, depending on the kettle shape, can enable you to avoid stirring the mash when you are applying heat. So can a pulley set-up. If your kettle is tall and narrow, sometimes these methods won't work as the bag full of grain acts like a syringe. If this is the case, you'll probably just have to stir the mash during heat application.
3. Most home brew shops will crush the grain for you if you ask them to. If they don't, they probably aren't very knowledgeable on all-grain so find a shop that does. Don't race into buying a crusher.
4. If you can get a hand lifting the kettle, maybe you can put it in a laundry tub to chill it? Fill the tub with a bit of water and change it occasionally. You could also let the wort cool naturally in the kettle (covered) overnight and then transfer and pitch the next day. Another option is to transfer it hot into what is called a 'cube'. If you do this, you can pitch weeks or even months later.
As mentioned above, when you choose a recipe, we can iron out the details.
PP
4.
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