Cheapest Car insurance for teen drivers?

I'm a high school student who saved up enough money to buy a 2005 Honda Accord for relatively low mileage for about 4.5k. I work full time while going to school (Co-op) and make decently above minimum wage. I'm trying to figure out what car insurance I should buy… None of my family members can put me on their plan so I'm stuck buying my own but I've did a little bit of digging but all the car insurance are ridiculously high I'm talking $400-700 a month not even a 6 month plan. My brother who's 24 pays about $120 a month and I can't figure out why I'm being charged so much…

What new car would be best for my needs?

I need a new car for a family of three.
I need it for frequent, long road trips and city driving.
My requirements:
Sedan body
Automatic transmission
Good fuel economy
Comfortable ride
Reasonable cargo space.
I was looking at these:
Honda Civic
Honda Accord
Toyota Corolla
Any other recommendation is welcome.

2009 Honda Accord coupe EXL?

Is 8500$ a reasonable price for this car at a carlot? It is a 4 cylinder with 89000 miles on it, clean car fax and 2 owners

Should I at least try a fluid flush on this transmission?

I'm not a transmission guy. Let's just get that outta the way first. I bought a 2002 Honda Accord that the lady said needed a transmission. In the trunk were dozens of empty fluid bottles, I forget what kind they were but I specifically remember they weren't what it called for. The fluid looks very bad but the transmission does NOT slip. The problem it has is that it has to be shifted manually, like stop, shift down into 1, 2, d3, d4 etc. Otherwise it tries to start out in 4th which is where I would assume the burnt fluid came in to play. I removed the shift solenoids and cleaned them, and it drove perfect for about 5 minutes. The transmission shop here in town said it's shot, and he wouldn't do a flush on it, but I think if I flush it and maybe replace those solenoids, it would last at least until I'm in a better financial spot to actually fix it. Should I try, or is he right by saying not to bother with it?

Transmission Sensors?

Every time I wash my car the transmission sensors begin to fail. Why could this be? Honda Accord 2010.

Trading in a car lease?

I'm currently leasing a 2016 Toyota Corolla, it was a three year lease I have about 6 months to go. It seems pretty difficult to terminate your lease early after reading my contract. I have received a few letters in the mail from different car dealers. In the letters the different dealers have all offered to pay off what I owe in exchange for a new car from their dealership. I plan on leasing a 2017 Honda Accord. If I take my Toyota to a different dealership will I be able to trade it in? If I'm leasing the vehicle is not mine. So I do not understand the way this works can someone please explain?