If you are looking at buying a dachshund puppy from a reputable breeder, be aware they are very expensive, and most decent breeders will have a waiting list.
Whatever breed you decide will fit your lifestyle, you will need to do masses of research into potential health conditions, so you can check that the parents have been properly screened.
Anywhere that has more than one breed of puppy is a puppy farm. Don't be taken in by anyone who says you can see the mother/father/grandparents. Most decent breeders will only own the bitches and possibly one or two of their older puppies. They use a stud dog to keep the best line, not just a male that they happen to own.
If this is your first dog as an adult couple, I really really wouldn't recommend a puppy. If you want a specific breed, try a breed rescue. They often have young dogs who have been rejected when they stop being cute. They are much easier than puppies.
Be prepared to wait as long as it takes for the right dog. Don't just buy the cutest cheapest puppy on Gumtree. You are setting yourself up for a lifetime of issues and health problems.
Dogs are not babies. They don't need fancy collars or fluffy beds. Far better to spend the money on a decent brand of food and good insurance.
Lifetime insurance is what you need. It will cover a specific condition until it is fixed, rather than other policies which will only cover the condition for a year or up to a certain amount. This would be especially important with a dachshund, as IVDD treatment costs an absolute fortune.
Insurance doesn't cover regular healthcare like inoculations, boosters and check ups. The excess is usually quite high too. We've spent probably £500 over the last 6 months on things that either weren't covered or not worth claiming for.