Two stages need to be taken care of, 1st, get things connected to the internet, 2nd, log into account for internet services.
Anything wired should be all set and connected to the internet as is, as your router will take care of that addressing, so should work immediately. Anything wireless, needs to be programmed with WiFi passwords set (you did set WiFi password in the router I hope?) in order to connect wirelessly.
Once everyhting is connected to the internet, you need to setup any internet services you want (hulu, netfix, etc.). You'll need your usernames and passwords for each account. Some devices just need to have those entered manually, others (typically "Smart" devices) will want you to go setup the account from your PC by entering a code the device will display (like on the TV) from whichever connected box you are setting up.
It's not complicated, just time consuming, and occasionally frustrating. Take your time, consider each step, and proceed. Good luck.