I can’t believe no one answered you.
1. If I want to send a prayer through Jesus name, what is a sentence that does this?
I say my prayer blahblah blah get me out of jail blah blah "in Jesus Christ name I pray to you amen"
That’s what I say. It’s not written in stone or any thing but just remember that you are praying to Jehovah but you only have this opportunity because Jesus died so you are praying through Jesus. At least this is my understanding.
2. If a homeless person prays for a job, would God give that man a job?
Put your burdens on Jehovah and he will help you. If the man is sincere in his prayer then, yes. I seem to only remember to pray when I’m in trouble which is sad. But dude prayer helps. And I just can’t deny that.
3. How do I know my prayers to God are being listened by God?
Jehovah hears all prayers. But I do remember hearing somewhere your prayers could be hindered. I don’t know the circumstances of that but God is such a forgiving one I’m sure you would have to be unrepentant or something. I don't mean like you hit that kid and you meant to and you’re not taking it back. Something more like you killed that chick and to justify it you killed that man and those two chicks and you don’t care what anyone thinks and if they get near you, you wanna kill them too.
I don’t really see why a person like that would want to talk to God but he might and I really can’t even say that HE wouldn't listen to their prayer.