Are all of your family members in agreement on the purchase of a dog? Do your current life circumstances have the possibility of changing drastically in a short amount of time (such as with a pregnancy, marriage, etc.)? This is a commitment for the lifetime of the dog, not just for a puppy. This commitment can last for 10+ years.
Have you considered the expense of owning a large breed dog or a dog in general? The food, vet visits, toys, equipment such as crate, bed, collar, etc can easily add up. The initial purchase price for the dog can be small compared to yearly costs of ownership.
Ridgebacks are great with kids and are generally very protective of them. However, they grow so fast that they can unintentionally knock over a small child when attempting to play. If you have small children have you considered this?
Puppies should not be allowed into areas such as communal potty areas/road stops, vet office floors, dog parks, etc. until they have completed their puppy vaccinations. This has the potential to cause problems with individuals such as those who leave the puppy unattended for most of the day, or those who live in apartments, townhouses, or condos. Have you considered this?
Puppies are unable to hold their bladder for more than their age in months plus one. Which means an 8 week old puppy may only be able to "hold it" for about 3 hours. This means if the puppy is indoors or crated overnight you will need to either provide a potty spot or take them out overnight/during the day. Young puppies should not be crated for extended periods. Are you aware of this?
Consider potential behavioral problems and how you will deal with them such as chewing, digging, jumping, barking, etc. No dog is perfect and will need consistent training from the start.