HI to everyone that owns a bullmastiff

so i need advice, i have been wanting bid dogs my whole life, and right now I've got the chance to have one, I had acouple other choices beside the Bullmastiff like cane corso or rottie, but bullmastiffs really took my heart.

my condition

I am a 19yo male iving in a share apartment that is fairly spacious and we have a balcony too, there are two huge parks and a creek just 5 mins walk from my house. i live really close to a vet ( 3 mins drive).

i live with one small dog and three cats. i heard that Bullmastiff are really gentle with cats and people in my house as the puppy will see them as family too. I already have a reputable breeder contact, a vet contact, and also because i understand how dangerous Bullmastiff can be if untrained I am planning to put him to kindergarten class, after he graduates from kindergarten i will put basic obedience straight away, and as soon as that's done i will have advanced obedience. I don't know if this is too much for the puppy because i just want the best for my future baby boy so i think in my opinion the training must keep going to keep him active, busy and happy. (correct me if I'm wrong)

i did my research about this breed and I know what to expect from this breed. i do not want to make any impulse decision on bringing home a sweet puppy, I wanted to collect as much information as possible about Bullmastiff before raising one. i would really love some advice, feedback, maybe a little help too. Everyone feel free to comment. i really need your help. Thankyou very much in advance