new to pcb creation how to pick parts?

hello,

im new to pcb creation and want to learn more.

its hard to pick parts. lot of bla bla bla for me and lots of pins i dont know how to connect. 

is here someone that helps the hobby guys out?

the basic things i can think of bud a lot is hard to figure out. i just downloaded the first free pcb creator on google. and start drawing how i think it should be. let me explain what im thinking of and show wat i got after.

i have an 12v system inside a car. the car has electric windows en central door locking. this needs to be remote. when the car opens the mirrors needs to come out and extra push needs to open the windows ( like a 2022 car) i wil be using a flipkey shell (all brands have a year they sold flipkeys so its easy to find). the opening and closing of the windows needs to be controlled by a programmable chip. and i dont know how to pick one. it would be nice to have a sms function if the doors open bud thats an extra idea i found out 433MHz is used in carkeys and found the parts in the creator its easy eda by the way. i have to look if the vcc can handle 12v or14.4v i dont think so so i need to bring down power somehow. found something caled 12v 2 5v so i hope its the part for it. the plan is to cut al wires after the switch and connect trough the board again. so no 12v is on it till i open windows by hand. i think i have to mesure to be shure but 12/14.4v is going trough the switch.  so iff the modulle have its own direct power all time, by relais it can operate the windows. 4door locking 4 windows 1 roof window folding mirrors it all should open with one button. so it needs to be smart. 

this is wat i got so far 12 ports on 12 relais. i put in a 433 mhz antenna en chip the data need to go to some chip and power needs to be 5v i think. i have to look up the chip specs. one port going to be 12v in and one ground both connected to a car system. the phone part im not shure off due the batterie use of it. car needs to start after weeks. 

i have to order a key to know how small the board inside it is. next month i order one.

so iff you pro's look at this wat do you think? yeah i know now you think its going to burn verry nice this way:P bud i hope someone can give me a push. you may know the perfect programmable chip for this that easy can operate this idea? 

i realy love to know. thanks and best regards

my englisch sucks i know local pages didnt help.