Lot's of kits and kegerators come with 5'-6' long beverage lines, which often isn't long enough for a balanced system, so get some 10' lines if you can and trim if needed. If you have the option for perlick faucets do it, otherwise you'll probably end up upgrading to perlicks later. Try using the set and forget carb method for at least the first couple times. You'll likely have a few small issues with balancing the system to start with, and burst carbing often results in overcarbed kegs (especially for those new to kegging), which will make balancing the system near impossible. Once you get the system balanced and working well, carb however you like. Buy an ugly used CO2 tank and swap it at a welding shop rather than buying a new shiny tank. It's much easier to swap than fill most places, and you can always ask for nice clean tank. Submerge the gas side conenctions in water or use leak decector fluid to test it after getting it assembled. It only takes a tiny leak to empty a tank overnight. Remember that we'll be here to answer any questions if you run into issues.
Edit: Apparently samc types faster than me.