A sacrificial zero clearance insert is a must in my opinion. Those plastic or metal interchangeable dounut inserts are OK. But for safety. No over head guard is a replacement for a tight fitting insert around the spinning tool.
I disagree. I have a bunch of bushings to tightly fit around the bit, but I don't use them. I made an aluminum ring for my basic most used insert. Since the plastic ones broke.
I dislike the dust collection that Norm recommended in the one I saw. I made the mistake of having dust collection pull air from below the table. I kept fouling my switches and filling the motor with dust. Motors pull from the head to the bit, so dust collection like Norm recommends reverses the direction and harms the cooling and messes up the motor.
I made a shroud that sucks the air from the router bit under the table, and also above the table.
I use my table way more than handheld. I have multiple Bosch routers. No router lift. It would be nice, but it's not necessary.
How you orient your table is based on what you plan on doing mostly.. think of it like landscape or portrait. if you are planning on doing large doors, you may want your router further back to support more of the door.
I use my fence to mount long oak pieces on, then I have stops for stopped routing which I seem to do quite a bit of at times, and not at others.
Some people go for a split fence where one fence side can be more forward than the other, good for jointing. I don't recommend that. Just go level and use shims if you need to do that. a deck of cards is useful for pushing one side further out.
Years before I had a router table I took a plate of aluminum and mounted my router to it. It did the job without any bells and whistles. What I am saying is the table can be basic to start to get the job done, and can be very elaborate. Some go nuts. I find less is better. Your fence initially if you need one can be a simple piece of wood with a hole or U where the bit is. And some clamps to hold it in place.
I will say if you can use a plastic laminate (formica or other) for the top. You need to be able to slide work and it helps to have a smooth surface.
I'm sure others here have many more thoughts. What are you planning on doing?