halo,

1.what items are u bring in?if cosmetic or other items that not allow things will stopped by the kastam.
The tax charged will according to items value.

2.depends on kastam ,some will let go.

3.please make a invoice of all items and put inside the parcel,list your price of each items in the invoice,try to state down the lower value.

can try to ask in this thread,all the professional are there ya.
http://forum.lowyat.net/topic/433543/+1380