As far as I am aware your medical test is valid only for 6 months. So if you could not join within 6 months of starting the process I would not bother wasting the time. Wait until you have a month or two left of the course, then apply. Or they will just tell you to come back later.
Abesha, the amounts of pay are on the web site, you can calculate it by the basic plus the flying hours. They vary by fleet but you would do between 70 (rare) and 110 or so hours (chock to chock is paid, not total duty) a month. Reserve month (every 7 months) varies either very busy or not at all)
Plus you would get allowances at outstation on layovers but it depends how disciplined you are as to whether you could rely on those.
To be very honest it's hard to save at the start but once you are settled in (after 6 months or so) very possible to save especially if you stay away from clubs/partying every night off etc)
It also depends on your personal finances. If you already have debt it will be harder to save until you pay it off, since it doesn't makes sense to save when you have debt.