You have to EB a lot, unless you feel like taking the week it takes to get 5 bil from the battle list. Repeat that for 5 weeks and another half week, and you will have enough for a T4.
Here's what you do, regen to full troops hit eb record how much you get from allies on the success screen then buy a small Allie(10mil) and repeat that, now compare the 2 bonuses from allies you wrote down if it went up then you do not have enough money in allies
U don't need to save u 25 bil most peps recommend u do u don't have u can start lvl 1 or lvl 2 save up lvl 2 like 15 bil or so. U Allie bonus needs to maxed so get all u monies u build is able to have. Lift Eb weights lol make sure your least make over bil in eb battles if not u need think changing clans. It's not that hard just takes patience.
You really should read all the posts Wulf has taken time to write on how to play they really help noobs with stupid questions who don't take the time to read the forums...ummm nothing personal but if the shoe fits