Hey Rock
1stly well done for pasing your PPL. Believe me the kind of flying you've just been doin is the most exciting you'll ever do in your life.
To ans your qu's:
1) Its a bit of a grey area, as to whether your school results count towards the job you get. However, they will count towards getting a "decent job" There are some airlines in the world, that will structure your payscale & or salary, dependant upon what educational qualifications you've got. I'd say always do the level best at whatever stage of education you are at, before moving into the field of "professional examinations & licences."
Where are you up to, in regard to your schooling life, how much further do you want to go? Is Uni an option for you? The reason I ask these qu's is because in 10 yr time, & believe me its not that far away, it will be hard to turn back the clock.
2) I'm not even going to ans this qu. One step at a time. You'll find out as time pushes along. If you are determined to become an airline pilot, you've got much much bigger fish to fry in the meantime. Don't get embroiled in all this $hit now, its not worth it. When the time comes you'll know what to do. Also with an ever changing market, your qu may well become redundant in the future. Just forget about it for the moment, & concentrate on the task at hand.
Let me know your views.
Good Luck & well done on that PPl
HPC