Give your puppy a few quiet days to adjust before introducing visitors or outings. A new home is a lot of change at once, and most puppies settle faster with less stimulation rather than more.
Establish a routine early: consistent meal times, frequent trips outside — after waking, after eating, after play — protected nap times, and a predictable bedtime. Structure is what makes house training click, and Dachshunds in particular do well with it.
Keep socialization going gradually. Positive, unhurried exposure to new people, sounds, surfaces, handling and calm dogs builds lasting confidence; follow your veterinarian's guidance about where a partially vaccinated puppy can safely go.
Continue veterinary care on the schedule your veterinarian sets, keep your Dachshund lean, encourage steady low-impact exercise, lift with support under the chest and hindquarters, and discourage repeated jumping on and off furniture. These habits are the most useful long-term thing an owner can do for a long-backed breed.