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I agree that you don't need to worry too much while taming but a bit of variety rather than one thing is always good, apart from the pumpkin seeds Serendipity mentioned other seeds like hemp, flax & sesame are good too, with the smaller seeds they tend to spend longer taking them off your hand rather than just grabbing one sunflower seed so they can work well for taming.
Agree about the food too, Burgess dwarf hamster harvest is quite a good mix but lacks a bit of variety & they can get bored with it, another good mix for diabetes prone species is the Bunny dwarf hamster dream expert, it has quite a lot more variety than Burgess.
Sorry Serendipity but I have to disagree about emptying the food bowl daily, even when changing mixes that can lead to picky eating as they tend to pick out the best bits & leave the bits that they aren't so keen on, I prefer to put enough in the bowl for a few days & not refill it until at least most of it has gone.