Startbonus:

Collections: 600 coins every 8 hours (7200)

For collection times check this.

We can also get up to 600 coins from a quest and 350 coins from each round of Dragon TV.

Dragons:

Wurm #176 costs 965 coins

Mana #540 costs 2390 coins

Pyre Magus #1321 costs 4855 coins

Black Magic #835 costs 10780 coins

Rime Magus #1320 costs 15230 coins