when you say stadium upgrades, do you mean increasing capacity? or something else?

which players should i aim for (what ever i am rated low in?) and does age really matter since i have just started and what type of wage shoudl i avoid since i have only 660k to use

and on training do u mean let them rest until 100% ? (then which do u use? 10 or 20 or 30%) and use them until players are at 60% right?