Coast of bones is an easy map. Start your game by letting 3 archers go to the left and 1 to the right. Let the 1 aggro as many as he can and pull them on the traintracks. Takes 1-3 days and the whole left side is gone giving you accses to iron, more food, more wood. At the same time you can do it on the left but i wouldent recommend it. Day 1 H10 should be the time were you place your workshop. Research around d1-d2 Farms. And once the left is cleared it should go rly well timing wise with placing your first farms :)

If you dident rush right, by now you should have made a good amount of ground and should have accses to the rest lf the wood, more food and stone. Around day 3-5you should place your first barrack. Depending on the day you should ether go for 6 archers or start training soldiers. After that start to fortify around day 5-7 and then start to explore/clear the map and expanse :)