Although syrian hamsters can live almost entirely off dried foods, fresh veg is an important part of heir diet too; you should feed your hamster things like lettuce(although not too much, just like once a week), carrots, spinache, grapes and peppers every now and then to keep him healthy and happy. You can buy sugery treats for hamsters from your lps, but try not to give him more than one type of sugery food once a week as it can rot his teeth. Supplying him with somthing to chew on like a peice of wood is also good
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Also make sure his excercise wheel is large enough for him as many excercise wheels sold for hamsters are for dwarf hamsters and not syrian ones, syrian hamsters(particually male ones) can grow quite large and many will outgrow their wheels given time and refuse to use them- it may be best if you get a guinepig wheel right now as that way you will know for sure it will be large enough for him for the rest of his life. Your hamsters cage is quite small, male syrian hamsters can grow up to 8inchs long, so you may want to upgrade his cage as well in the future- in the wild syrian hamsters can have terotorys of up to 2miles.
You should take your hamster out and let it run around or handle it for at least 30mins every day, many people comment on how hamsters can bite, but they only do this is you don't carefully and pateintly handle them often enough. For most hamsters though, they will only bite if they smell food on your fingers and not out of agression
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As for handling, try not to take him out of his home when he is sleeping- it may scare him or simply piss him off, but the best way to tame your hamster is when its convienient for him i.e when he's not sleeping, chewing on things or moving food. Syrian hamsters regulate their own diet, its best to always make sure he has food in his food box as its better to know he's got all he wants to eat rather than to accidently deny him of food he needs in his diet.
And the best hamster bedding in my experience is toilet paper- they love to chew it up! Don't buy that nasty cotton bedding some lps's sell as the fibres can get caught around their legs or get swallowed.