I assume you'll be transferring out of a bucket or carboy into a "corny" keg?
personally my procedure (i'll actually adjust to more common procedures) is to first clean and sanitize my kegs, I will disassemble the posts, clean the posts, dip tube and co2 inlet with a small brush, then soak in sanitizer with the lid while i clean the keg.
at this point, cleaning the keg first with a kitchen scrubbing pad and rinsing, then adding 1/2 gallon of sanitizer i will re-assemble the keg and pressurize with co2. this gives me a chance to check for leaks at the posts, generally i'll pressurize the keg to 10-20psi for this, and shake it up to distribute the sanitizer. disconnect the co2 and I'll then push the sanitizer out the tap/faucet until it is purged of all sanitizer AND co2. I'll then hit it with another 10psi of co2 and pull the release valve. now my keg is ready to fill.
open the lid and rack the beer into the keg using a sanitized (inside and outside!) hose that goes all the way to the bottom of the keg. this reduces some oxidation as opposed to just letting it splash into the keg.
once the keg is full (i actually do closed pressure transfers by weight) I will then pressurize it with 30 psi to make sure that all the seals are seated and put it in the fridge for a day with the co2 disconnected. in a day usually the co2 will come down and I'll start with my carbonation, I carb at around 12psi and 36F for 1-2 weeks. keep in mind you should look into line balancing (google it, you'll find all sorts of things, tldr? you need about 4.5' of 3/16 beer line to get a good pour.)
I personally keep my co2 outside the fridge so i have more fridge space. I cannot understand why Jomebrew seems to think keeping it in the fridge helps. 10psi of co2 is 10psi co2, the regulator delivers 10psi regardless of temperature if that is what it's set at. you won't use more or less co2 regardless of tank position.
Other recommendations i would make, purchase quality forward sealing faucets. intertap and perlick are the gold standard of the day. you'll pay a bit more for perlick, i think its worth it. I use Stainless Perlick faucets and don't look back at the days of using cheap "Krome" faucets. they constantly stick, need more regular cleaning, and just suck.
don't forget to get some Beer Line Cleaner and maintain some form of regimen for cleaning your lines and taps occasionally. some say to clean monthly, some folks clean yearly, ymmv.