Read as many puppy training books and websites as you can. Mark parts that appeal to you. Bookmark sites that seem helpful.
Watch videos. Youtube is a great resource for this.
Decide which methods most appeal to your personal style and your life. Discuss with your family members the training methods you will use.
Pick a vet.
Review the schedule for vaccinations and know when you'll need to make an appointment. I put reminders in my family calendar app so I don't forget.
Select a groomer, if needed. If you aren't comfortable clipping or grinding down puppy's nails, you'll want to find a groomer for this even if your puppy won't need to be clipped or groomed.
Investigate puppy training classes available in your area. Training is a vital way to create a strong bond between your puppy and your family.
Check out your state law regarding dog licenses.
If you have a yard, consider a physical or electric fence to give puppy a place to play off-leash. I can't tell you how many years you'll lose from your life when you have to figure out how to get that energetic 6-month-old puppy back to safety.
There's almost as many things to do to get ready for a puppy as there are for a baby! Don't get overwhelmed. Just break the list down into manageable chunks and tackle them one at a time.