Point 1-
Yes, we still will have free will. But, God being all knowing will only have those in Heaven with Him who have made a "heart decision" to follow, believe in and have faith in the Trinity and want eternal life.
They will gladly live according to God's guidance in order to avoid any evil, which God will not allow in His Kingdom anyways.
2- Of course God has a "free will". But, He chooses only that which is good because He loves and is love. But, look at the time when God was going to destroy the Jews when Moses was leading them, then when God did destroy all of mankind but Noah and his family.
So, God can eventually lose patience too, but, when He does, its always purely rightceous, unlike man's sinful condition now.
Point 3- Do what we want-
Yes, within reason of staying inline with God. What would anyone granted eternal life and Bliss with God want to do anything selfish, when God will provide all things and no more tears as well for all His Children?
If anyone has to ask that, they need to ask themselves, why ask it? Because they want to live in perfection with God and still be free to sin? Think not.
Point 4- Whats Eternity and Heaven like?
Try reading the Scriptures related to Christ's reign on earth first. That is a shadow of the eternal Heaven we will spend with God will be like.
Heres an example- The lion will lay down with the lamb together. A little child will lead these wild beasts. No violence. Animals will eat straw and herbs of the field together. etc, etc. No more death.
Point 5- Will we like what God will give us to do?
Why would we not? If not for God, you, not any others nor I would be here today, or lived our lives as we have. There is nothing n existance that has not been created by God.
Read in Revelation Chap. 20 and on, about how we will live on the new Heaven and new earth. The size of the New Jerusalem and how te Kings of the earth will come to pay homage to and Glorify God at the new City.
God's Children will live all over the earth and will come as they are lead to, to the city, to praise and Worship the Trinity. There will also be those God will choose to serve in this new City under the Trinity.
There will be leaders probably of all levels spread out around the new earth to help answer questions God's children may have.
Theres alot more God declares in prophecies about the eternal existance of us with Him, if people will take the time to read God's Word and study it to learn it.
God Bless!!