u start doing gold dailies as soon as they are avaible. There are plenty of guides for newbies or aigis videos on youtube with low level units (i think i even saw the easy and normal maps done with under lvl 20 units). Aff and spirits dailies are not that important (unless u want the free sc for 3staring it) since u will get most of your aff/spirits from challanges. DCs should be done as soon as posible as well , and for that , u should get 2 cc-ed archers asap and 2 cc-ed healers as well. Farming the hard map is generally better