Playcall is really only good if you sim the game. if you play the game yourself aand call the plays, it's pretty much a waste. If you sim though, it is essential. I never touch Chemistry myself. I usually put get to 3 in performance, and then just fill in points where I need to. If I have young cornerbacks who need to grow, I'll put points there in develompment. If my corners are pretty much close to their max already, I don;t bother and put those points in elsewhere.
Also, if you have a high level DC, and a very low level OC, it's better to put points into the offense to pick up the slack. So basically, I just put points where they need to go most. Also, some positions progress more than others on their own. A QB or a RB seems to pretty much progress regardless of your skills because they have statistics that actually propel them. CB's and Safties tend to need more of a boost from coaching points, as do OL. Probably because the stats they get aren't always as easily measured.
Also, if you use sliders, getting anything over the first rank in Special Skills will eventually make you pretty near unbeatable. The sliders can help even things out in the beginning, but as you progress, they start to stack things in your favor if you don;t limit how you build your coach. If you don;t use sliders, the first few seasons while you level your coach and players up to match other teams will be harder, but you once your stats start to build, you'll Start getting better and better. So if you want to be competetive right off the bat regardless of your team talent, use sliders. If you want to have to build a team from the cellar up to a contender, and want to have a few rough seasons until then, don;t use sliders. I myself don;t use sliders because it's more satisfying to me to build a team up, go through a couple rough years, and then start making the playoffs and eventually making Super Bowl runs. But that's all strictly personal choice again.
As to what team, it depends probably on what you want. The Jets would be a bigger challange because they play the Patriots twice a year. The Seahawks don't really have anybody in their division worth much anyway, so it would be easier to win that division. if you stock as many draft picks as you say, the actual roster shouldn;t make much difference. In a couple years you will have completely remade either team anyway. So I'd suggest just deciding on where you want a tougher, or an easier route to the playoffs and pick from there. One thing to not about the Jets though. They have a very good start for an O-Line already in place, so if you like to run a lot, they will help you run earlier in your career.
As to offensive philosophies, well, ite depends. If you run a zone blocking playbook, the that would be a good pick for your OL. I typically go ballanced right down the line. I want to know my players are balance enough to work in any situation. Setting a LT to Pass blocking could make you wind up with a 95 overall LT who can't run block at all because the game puts most of the emphasis on pass blocking to determine the ratings. If you run a lot, and don;t have your FB catching many passes, set thet to blocking to find better blockers.
A couple things to watch out for. Speed Recievers is a completely misleading philosophy. Sure, you can find the burners, but a lot of those who will show as 90+ rated recievers will be fast guys who can't catch to save their life. If you like a lot of quick, shot passes, I'd go with the route running or balance philosophy. Also, stay away from the Engulfer OL philosophy. It's pretty much just based on Strength, and you'll wind up with LT's who have oustanding ratings who can't pass block to save their life.
So basically, choose your team, then your playbook, and work from there I would say. In my experience though, ballanced tends to work best for most offensive positions except maybe FB and QB. I typically go with Field General for QB myself, or if not, Pure Passer.
One thing you can do btw, is change your philosophies based on your needs. If you have a couple smaller,quick recievers already on your team and want a big red zone target to add to that, in the offseason change your philosophy to Tall/ Red Zone Threat to help you find that. The Philosophies are pretty much there to help you rate a player based on what you need. If you have one very good quick, route running WR, and one slower, tall possession reciever, then based on whatever philosophy you have active one will be high rated and the other will be lower rated. But they will both continue to play and perfrom according to their individual rating anyway, so it really doesn't make that much difference once you have found and signed the players you want. In my current franchise, I have a low rated WR who is my deep threat and does a great job at it, but because my philisophy is set to something else, his overall rating doesntt reflect what he actually does on the field. By the same token, I have a power back for short yardage situations, but because he's not fast, agile etc, he's not high rated. But he gets the job I got him for done.
There are a ton of ways to build your team. Just picture what you want the team to look like, and build each position accordingly is my advice.
Sorry for the wall of text. I hope some of it helps you out though.