I will be wainting on the answer,Thanks

I usually plant them the same depth as the bulb so if the bulb is an inch high I plant them an inch deep (this is assuming you are planting in the open ground). Again size of bulb dictates spacing larger bulbs need more space between them - rule of thumb would be give same space between as height of bulb.

it useually says on the packet

but i usually put them 30 centemetres apart

that is much too far apart for small bulbs like snowdrops and crocus Charlotte