Beautiful colors!!!! He's going to be gorgeous!!!!
When Brodie was a puppy, I bought a few pricey brushes from Chris Christensen. I have the 16 mm t-brush and Mark II small slicker (both of which I use extensively) and a Mark VIII Round brush which I don't really use much at all. I had initially bought another, less expensive slicker that I read about here, but once I got the T-brush from Chris Christensen, I opted to replace the cheapie for one of his and am very glad I did. The round brush was a waste of money for me as I don't use it but that could be due to Brodie's coat. Brodie is just about to turn 2, his full adult coat is still not in, but he doesn't seem like he will be a heavily coated pupper - he takes after his mom more than his dad. His dad was a puff ball, mom was not - he is not. I also bought an inexpensive fine/coarse comb which I've never used but would be useful if your pup ends up with knots around the ears. Brodie's fur does not really knot but some shelties do and you won't know that for some time. I also have 2 sizes of inexpensive rounded tip scissors and will be ordering a pair of thinning shears - the thinning shears I won't go cheap on cuz cheap ones tend to pull hair versus cut it. The two other tools in my arsenal are a set of Peanut trimmers and a cordless Dremel 7300PT.
I groom in my family room on the floor. Starting from puppy stage, I got Brodie used to laying between my legs and at first simply sat there loving on him with all the stuff around us. Training times for grooming were VERY short as a puppy - he wouldn't really sit still much. Puppy training classes go far for this, btw, getting to the AKC 'Good Citizen' certificate stage in a training class gets you on the road to sit, heel, here, etc. while providing much needed socialization. Back to the subject at hand, I eventually began to run the small slicker over his coat - not the bristle side, and then when comfortable with that, the brush side. Brodie loved to chew, the brush handles are wood, so sometimes a way to keep his attention off me was to allow him to chew the brushes - we have teethmarks to prove it! The most challenging was the Dremel, we started with letting it sit on the coffee table for a while - no big deal right?! Then progressed to just touching it to his paws, then letting it run while it sat on the coffee table. I 'groomed' him daily as a pup and every single time he got a treat - we are BIG believers in treating here. Do stuff, get rewards! Yeah!!!
Brodie now gets brushed once or twice a week. He gets excited when I ask him if he wants to get brushed, goes to the pantry with me to get him stuff. He will lay on his back while I dremel his toes, use the peanut to shape his feet. I do alternate between a few grooming conditioners and just plain water to dampen his fur when I brush him - too much conditioner builds up on the fur and you don't really notice it until you bathe and it goes away and the fur feels so very different. I use the short blunt end scissors to trim up messy ears and the longer blunt end scissors to cut a 'poop chute' in his back pants about once a month or when he ends up with what we call 'dingle-berries'. We end every session with a treat, a lot of praise, excitement, gushing over how beautiful he looks and he loves it!
Ann here on SN gave me lots of advice on tools. I know there are a ton of threads on grooming and supplies - overwhelming choices.
One thing I failed to do as a puppy and will correct with the next one is to teach brushing as a puppy. Brodie HATES to have me brush his teeth. On occassion I am successful but not often and surely not as often as I would like. He is so chill about all the other aspects of his grooming, I am sure he would have been that way about his teeth as well but I never thought to include it. He is fascinated by me brushing my teeth, though, that is the best way for me to have access to his - I brush mine and takes breaks to brush his - seperate brushes - haha!
) and he is all the sudden really itchy. I am not seeing anything on his skin and he is treated for fleas so I am wondering if maybe he just needs a bath with some conditioning solution for hair/skin? I am SLOWLY introducing water because he is not a fan, but do you guys have some products you could recommend or advice on what is going on? 
he HATES it. The only person he's snapped at so far was when the vet tried to get a look. I bought some cheap brushes today from chewy with the plan of replacing them later if needed. I am thinking he's going to be on the puffier side. We've seen TWO other sheltie puppies out and about and he was much fuzzier then either of them (also the only boy?). only time will tell. He tail is definitely coming in nicely though!