Like a vanilla log leaf block

I am Japanese. So I'm sorry if my English isn't good.

I'm trying to make a mod that adds several kinds of trees.

However, the leaf block I added does not disappear even after cutting the log.

Even if you break it by hand, it will not drop items randomly.

I heard that you would use a route table to drop random items.

However, the Japanese blog that explained that has stopped updating.

I want to know three things.

1.A method in which the leaf block disappears over time after the log block has been cut.

2.A method that does not disappear over time when only the leaf block is placed.

3.A method of dropping random items or nothing when breaking a leaf block with something other than scissors or silk touch.

It would be helpful if someone could tell me.