Get fitted for boots. It's great you know you're 24.5 shell but that's not going to help you very much past a reference point. Besides, feet change and they're going to check your size when you get fitted. Or don't get fitted and buy a sweet pair of Full Tilts off the internet since you know your exact size. Either way I don't give a fuck.
Poles are poles. Either spend money and get some online or from a store or go to the rental shop and snag a pair. Also depends on how you want your poles to fit, either forearms at about a 90 degree bend or if you want those stupid little park poles then make sure your hands can be all the way hanging at your sides and you slouch like a gorilla. That will ensure you're halfway to being a knuckle dragger.
Skis are.... skis. If you want park skis, get park skis. Pipe get pipe. All Mountain get all mountain. Powder powder.
Most of this research you can do and find out what you want. Other than that the questions on skis you have can be searched and answered. My advice is choose some shit you have an interest in and ask a Backcountry.com rep on the chat feature. They seem to know their stuff.