There are just a few verses that support the idea that we have free will. Although I guess it depends what you mean by free will. When I look up the word free will I get this.

free will noun

Definition of free will (Entry 2 of 2)
1 : voluntary choice or decision I do this of my own free will
2 : freedom of humans to make choices that are not determined by prior causes or by divine intervention

Hmm well, that is what it says but I guess I was leaving out the last part “not determined by prior causes or by divine intervention”. Anyway, I have always used free will to mean the ability to make choices and the ability to control our actions with limits of cause. So that is what I will be defending here because I do not believe that God controls our actions nor do I believe he is to blame for sin. The first time I heard people speak against free will was on a site that was trying to prove that universalism is correct. They did not believe in free will at all. They believed so strongly in God’s sovereignty that they literally blamed him for every action man takes. I mean every action as they were that much against the idea of free will. I remember having many discussions with them. They always had a convincing reply, however, and thankfully I was still skeptical of what they were saying as I do not like the idea of blaming God for sin.  So that leads me to my first verse and one God himself lead me to defeat the doctrine of this group. 

1 John 1:5
King James Version
This then is the message which we have heard of him, and declare unto you, that God is light, and in him is no darkness at all.

Another verse is

Isaiah 45:7 King James Version (KJV)

7 I form the light, and create darkness: I make peace, and create evil: I the Lord do all these things.

For the above 2 verses to not go against each other the easy answer is that when God created our ability to choose and the ability to act under our own limited will, evil was created.

I would list a bunch of verses that show that humans have the ability to choose I am going to show you something else that would prove that grace is not irresistible which also proves we have the ability to make choices and are responsible for our sins, not God.

Matthew 23:37

KJV
O Jerusalem, Jerusalem, you that kill the prophets, and stone them which are sent to you, how often would I have gathered your children together, even as a hen gathers her chickens under her wings, and you would not!