Ok well im gonna put this guide together in easy steps.
1) Add a ton of friends and possibly join a guild(this is so you can pick which depth you want to jump to)
2)Now pick a friend who is at depth 14 and join him/her.Now do a run until you complete depth 16 and then go up to haven. This should have earned youbaround 4k crowns + mats. Do depth 14-16 2 more times.
3)You should have made around 12k crowns. Buy 200ce.
4)Now do depths 14-16 six more times your ce should be doubled(24k crowns=400ce)Basically each time it doubles your ce.
hint 1:I recommend doing jelly runs.
hnt2:sometimes only buy 100ce so you can keep the 6k profit
Hint 3:Sell mats in the ah for good prices
feel free to impove and give me and others more tips
Well... all of these has been said many many times. not to mention the other crown guides on the forum.