[SOLVED] A few Questions

Hello everyone!

I had a few questions to ask you guys to help me if you don't mind;

1- How can I make a block with loop sound or constant sound? Like the furnace for example.

2- How can I make a sign? Well not a sing, more like a command block similar to a sign and when you click on it you can write a command (if is not possible with a sign i will be happy tho)

3- I want to disable the vanilla entity spawn in my mod cause I made my own. I tried the procedure: When "Entity joins the world > Despawn" and I did for every mob, but for some reason sometimes i can see for a second how they spawn and despawn inmediatly. Any way to avoid dat?

4- Its possible to make a flyable mount? For now I just made the normal ones, the land ones.

5- I want to make a weapon/power that requires pre-charging and release an energy field. can someone tell me if is posible and how to do that? (just the basics)

Thnx to everyone~