ST's are people pleasers. Sweet little dogs. The puppy cut is the way to go if you aren't into regular brushings to keep it in full coat. If it is rather large, then it probably is overweight. ST's by breed standard should be small, and probably should weigh less than 10 pounds. And 10 pounds puts it on the heavy side. There are lots of ST's out there who are larger than breed standard, though. It's not a show dog so it doesn't matter as long as it is not overweight. You should be able to easily feel it's ribs.
Make sure you feed a premium dog food. Nothing from the grocery store. You want something with mostly human grade ingredients. Stay away from anything that has corn in it. And for now - definitely stay away from any food or treats with wheat gluten in it. That is the ingredient that has caused many deaths over the past several weeks.
If you feed a premium dog food, you should not have routine or possibly any problems with full or impacted anal glands. If you feed a premium food, the stools will be firm enough to empty the glands each time they have a BM. If you notice that the little darling is doing the butt scoot, it is probably either anal glands needing to be expressed (which you can learn to do yourself, have the groomer do it, or take sweetie pie to Mongo), worms, or as I noticed in one of my Lhasas the other day who has NEVER butt scooted in 7 years - he has a piece of stool that had dried up against his anus. So any obvious butt scooting should be looked into as there is something going on.
ST's are some of the cutest dogs around and just as sweet as can be. I'm not sure how brainy they are, but you aren't taking the dog because you are looking for an Einstein. I have seen and held some ST's at my groomer's that I would have loved to take home with me.
If the ST is not neutered, I would have it done. Cuts down on the risk for testicular and also anal cancer, if I remember correctly.
Sounds like you have done the research, which is important when considering a new dog. I have never heard anything really negative about the ST's. They are perfect lap dogs and will want to be with you and the family as much as possible. Definitely an indoor dog. Sweet sweet personalities - I guess I would compare them to "blondes." But smarter.
Enjoy! Sounds like you are getting a little prize. What's his name? Killer?