"Dogs are not our whole lives, but they help make our lives whole."
-Roger Caras

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There are lots of tips online about introducing puppies to existing dogs in the home, so I am not going to re-invent the wheel here. You can go really extremely cautious and slowly, or just plain bring the puppy home and let them meet if your current dog loves meeting other dogs.

But, do expect your current dog to growl and snap at times! He has to teach the puppy how to properly behave, and will use that dog language to tell the puppy when he's had enough of play time, or when the puppy should stop nipping/biting him.

One thing that is important is to continue giving your current dog lots of attention, so he doesn't feel like you are abandoning him and giving all your love to the puppy.

Also, have a crate for the puppy to spend time in (to relax and calm down, too) which will give your mature dog a break from the puppy.

Here are some links with some good/better tips, and a search would also give you many more good ideas of what to expect and how to best do it. Take the time to visit these, as some of their tips in the lists are very good ones.

https://www.clickertraining.com/what-to-expect-introducing-a-puppy-to-your-adult-dogs

https://www.rover.com/blog/introduce-new-puppy-older-dog/