The New Testament doesn't have any required tithe.  Required giving was Old Testament law.  The New Testament is grace and it makes it clear in 2 Corinthians 9:7 that you can give what you want.  If you don't want to give anything, you don't have to.  And if you want to give, you can give where you want, just make sure your giving is in the name of Jesus.  As for heaven and hell, here is the truth: The Lord Jesus Christ is God. Nobody can be good enough to avoid hell. The truth is that death leads to immediate heaven or hell, depending only on whether the person believed on the Lord Jesus Christ, or not. The truth is that the Lord Jesus Christ loves you and wants to bless your life freely :) Most of all, Jesus wants you with Him forever, and not in hell. It is too late to be saved, after death.

Believing on the Lord Jesus Christ means being forgiven all sins past and future and means going to heaven. The truth is that every belief except one will lead to eternal torment in the lake of fire for every person. Because nothing pays for our sins except the death and blood of Jesus, the sacrifice of Jesus that is already accomplished by Him . Jesus loves you! The truth is that the Lord Jesus Christ is God, and Jesus died on the cross to pay for all of our sins in full, and then Jesus was buried, and then Jesus resurrected from the dead. Nothing else pays for our sins, not works, not deeds, not religions. So the only way to heaven and to avoid hell, is by believing on Jesus for eternal life (John 6:47), without adding any of your own works (Romans 4:5). Believe in the Lord Jesus Christ to take you to heaven, and you will be in heaven, no matter what, guaranteed. That easy, thanks to Jesus! Tell Jesus that you thank Him that you will be with Him in heaven

This is always in dispute.  I don't think anyone REALLY knows the answer.  I tend to think the Tithe finished with the Israelites, yet I feel guilty if I don't give it to my Church.  They don't give to the poor out of the tithe at my Church.  I think it goes to pay the Pastor, clean the Church, pay bills, etc, because we have a Missionary Secretary who raises money separately for Missions and we pay into those causes as and when required.

I know Paul intimates we should give bountifully because then we shall reap bountifully and so "Let each one give as he purposes in his own heart - not grudgingly or of the necessity for God loves a cheerful giver" (2 Corinthians 9: 6 - 8) so I think we all have to decide for ourselves by praying about it and doing what we believe is right in the sight of God.

I don't feel qualified to advise anyone else what to do

The responsibility for due diligence, so as to avoid wasting your money on poorly run or fraudulent operations, applies to all such endeavors. 

There are 4 churches in my town, and NONE of their clergy are highly paid.  Not even close in fact; at least one has to have another job simply to live, and I think one of the others does as well.

All assemblies budget their tithes and offerings to include mission work.

You have issues, but no clue. 

No, both are in need. If nobody gave money to the pastors then they wouldn't be able to teach or lead. If you like, go to a less well off church and still continue to support the poor. But a tithe, honestly, should be the least amount of money you give.

One would presume...

Yes, although note that the tithe (10%) was only an ancient Israelite thing.  NT giving is different (2Cor 9:7).  Not only do I give where I go to church, but to other Christians causes too.

The dollars from real estate enable the church to help poor people. Get educated.