Buying a puppy is a major commitment, which both you and the breeder will want to ensure is likely to be successful. 
Here are some questions you might want to ask the breeder and which the breeder is likely to want to ask you.

The answers should give you a pretty good idea about the breeder's
motivations for having the puppies, the way they keep their own dogs
and the sort of after-sales service you are likely to get

Ask the breeder...    

How long have you been a Dachshund owner?

How long have you been breeding Dachshunds?

How many litters do you typically have each year?

Which Breed Clubs do you belong to?

Which Shows do you typically exhibit at?

What successes have you had when showing your Dachshunds?

What are the positive traits of this breed?

What are the negative traits of this breed?

What health problems does the breed suffer?

What is their average life expectancy?

What endorsements, if any, do you put on the puppy's KC papers?

What should we do if we ever need to re-home a dog we have bought from you?

What written information on diet and rearing do you provide?

What inoculations, if any, will the puppy have had when we get it?

What insurance cover, if any, do you provide with the puppy?

How many of these puppies will you be keeping yourself?

Will you be showing any of this litter?

How much grooming do they need?

How much exercise do your dogs get and how much will my puppy need?

Expect to be asked...

Are you out at work all day?

If you work part-time, how long will the dog be left alone?

Have you had a Dachshund before?

What other dogs do you have, if any?

What other pets, if any, do you have?

If you have children, how old are they?

Do you have a garden?

Is your garden well-fenced?

Do you live in a flat, or a house?

Do you live in the town, or country?

Why do you want a Dachshund?

Do you intend to show your Dachshund?

Do you intend to breed from your Dachshund?