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OOOOOOooo... I remember myself in a similar situation: D
I don't play as mages that often myself, but:
1. At the very beginning, if there isn't a tavern, build one and buy the second hero of your faction and their entire army.
2. Then, either build a guild level 1 or buy where the gremlins are.
3. Same as with 2!
4. Gargoyles can be, or even should be, acquired!
5. I rarely build golems at the beginning; I go with mages, even though it will be resource-intensive, but it will be easier to defeat mobs.
6. Simultaneously, build a town hall, etc.!
Many other forum users will tell you a lot more, and I'll add a little more from myself:
In the chests during the first weeks, take enough gold to be able to build a capitol on the 2nd or 3rd week!
Turn the weakest melee units into single units; they are very helpful!