Love, consistency, socialisation, routine and training classes are all you need.
We're on our 5th giant breed puppy in 12 years, the only downside of giants are their relative short lives but it does give lots of experience of raising pups. Yes, they are a massive amount of work for the first year or two. The first 20 weeks being the hardest with sleepless nights and housetraining.
We crate train every pup as they will not mess their beds but be aware that their bowls and bladder cannot physically store more than a very small amount. A 9 week old will need at least 2 trips out over a 6 hour night sleep in their crate. When they pee in the house it's because we missed his need never because he's naughty. No dog is ever naughty - they just behave in a natural way for their need at that moment on time. Our latest boy has been clean in the house since 12 weeks old because he was taken out immediately when he woke up from any length of sleep, after a long drink, after every meal, after a play session, on the hour every hour, except through the night with potty trips every 2-3 hours through the night, when he sniffed the floor and finally, when my spider sense tingled. When they have slipped, never ever shout or they'll pee in secret behind the settee, etc. Use an enzyme based cleaner to thoroughly clean the carpet or floor - Simple Solution is good.
Regarding biting, it's normal, all you do is make a loud yelp noise yourself and stop immediately the play, turn your back and cross your arms for 10-20 seconds and they soon learn they lose your attention (what puppies crave more than anything - even cross attention is better to them than being ignored). If puppy is really acting up then use time out for 10-20 seconds where you pop them outside on their own, often works to reset any crazy bitey tantrums. Again, don't shout.
I cannot recommend enough that you get booked onto a Kennel Club Puppy Class run by a kind reward based trainer - ideally someone who is in the Association of Pet Dog Trainers. We follow the Kennel Club Good Citizen training to at least Bronze with every dog we have and will be doing Gold with our female who loves obedience. It is great fun, informative, a good way to get troubleshooting advice from a professional and will completely improve your relationship with your dog.
Finally, get puppy out into the world immediately (carrying in a sling or backpack before vaccinations have been finished) to meet strangers, buses, trains, cars, prams, horses, cows, umbrellas, children, elderly people, people wearing hiviz, bin lorries,etc. Just Google puppy socialisation list for more ideas. Also work on introducing the vacuum, lawnmower, washing machine, etc slowly and with nice treats, there are excellent Calmsound audio tracks on YouTube to socialise to traffic, fireworks, power tools, take it slowly and build volume over time as pup is sleepy.
And despite all the work, enjoy your pup, take lots of pics and keep us updated. My dogs are the most important thing in my life as part of my family and I'm sure yours will be too.
although at the start it is so hard. Especially if it’s your first dog. 
) but he is fully toilet trained and we can leave him for 4-5 hours during the day now which makes life SO much easier. I know it will get even easier eventually so there is light at the end of the tunnel. Someone told me that the harder the puppy to train, the better the dog. I really hope this is the case. He is a clever pup but very demanding and clingy.