I use Panacur for worming. It's very safe, you can use it on young puppies. I buy that from the vet.
With modern wormers you don't usually see worms in the motion as lots of the newer products dissolve them.
For online things, like Promax, I use Viovet. they've always been very good to deal with, but there are others.
The scooting could be either worms or anal glands, as it's just a sign of irritation & itchiness. It's easy to clear the glands if you get someone to show you how the first time you do it....smelly job
