Flight planning: I feel confused and overwhelmed, any help would be appreciated

thanks that is great, i will go through the vid i dont think i have seen this one yet. with ATC i do admit i have issues as sometimes i approach the destination but start talking to ATC too late and i am not sure if its AI is advanced enough to take into consideration my status etc, i need to do a bit more research on the matter, i often am on the correct landing descent or “base leg” whatever its called and it sets my route from far past, tells me to go 16000 ft etc while i have completed the aproach already.
One question though, do you recommend rather spend more time in 1 aircraft and learn everything about it, or use few for the flights if i am not that experienced? I feel like the propeller planes and Cessna are quiet straightforward and i get lost in the A310/737 but maybe i should learn the ins and outs of a single plain first? is there a recommended “difficulty” tier list of planes to fly in MSFS or community perception for “starter” and “advanced” planes?