How can I configure droppers for Minecraft Bed-Wars?

He
2

I need a dropper that drops an iron block every 10 seconds.

I need one who drops a gold block every 15 seconds.

I need one who drops a diamond block every 20 seconds.

And the last thing I would need is one who drops a message block every 25 seconds.

The whole thing is for Lucky Block Bedwars. You can buy lucky blocks for the blocks and equip yourself.

Ya

Wouldn't a command be easier?

He

Yes but i don't know how to do it