[h1] Here's so trash info to help you get somewhat better at TF2 [/h1]
Use the stock scattergun on scout
Don't rocket jump straight up
Aim at the feet with soldier's rockets
Always try to get away as soldier if at close range so you don't kill yourself with splash damage
Use stock shotgun for Engineer
Engineer's melee is up to your playstyle
Set sticky traps as Demoman, nobody expects them
Don't rush as scout unless you know they are on low HP
Don't try to attack anyone near the supply lockers
Don't sentry camp if there's more than 5 players on the server as you can get votebanned for that
Download the map tr_walkway to train your aim and rocket jumps (if possible) there are alot of YouTube tutorials showing you how to instal the map
Rage switching in a pattern like yours (Pyro, Scout, Soldier) is very predictable, try to switch to other classes or just don't switch at all

And now some classes that are off limits for begineers:
Sniper
Demoman (not demoknight)
Medic
Scout (somewhat)