Front court toot of whistle

[Self]

I am wanting to confirm I am reading the rule correctly. All front court throw ins will be administered by tooting the whistle first. I was under the impression that the new rule was put in place to follow the womens college mechanics where it was only from the lead on the endline. Which is correct?

Also our trainer was telling us that the trail on a throw in by the lead staying in the front court chops the clock and the lead merely counts 5 seconds. Also womens mechanics I thought the lead counted and chopped and the trail mirrored the chop for the scores table purpose mainly?

Thanks....