Here are Biblical scriptural guide on what thanksgiving to God entails.
BIBLE STUDY SESSION
Topic: Understanding the Power of Thanksgiving

1. What is Thanksgiving?
Answer:
A. Acknowledging God as the one behind the good things around us. Jn 3:27 / Lk12:15-20
B. A celebration of the acts of God in our lives. Ps 103:1-5 / Ps 118:23.
C. Appreciation of the present in anticipation of the future. Jn. 6:6-11 / Jn 11:41 – 44.
D. It is ascribing all the glory to God for where we are. Jer.13:15 -17 / 1Cor. 15:10.

2. Why do I Need to Give God Thanks?
Answer:
A. It is a debt we owe God. 2Tim. 1:3.
B. It is a seal for answered prayers. Phil. 4:6 / Math. 6:6-9
C. It is the platform for supernatural multiplication. Jer. 30:19 / Acts 2:47.
D. For the preservation of our blessings. Mal 2:1-3 / Ps 28:5.

3. What do I Thank God for?
Answer:
A. For His benefits. Ps 103:3 – 5.
B. For His faithfulness in our lives. Ps 92: 1-3 / Ps. 145:8-9.
C. For anticipated victory over our enemi9es. 2Chr. 20:20 – 24.
D. To keep the Anointing for conquest fresh on our lives. Ps. 89: 22 – 24.
E. For His good hands upon our lives. Lk 17: 12 – 19.
F. For rendering our enemies helpless. Ps. 138: 1,7.

4. How do I Give God Thanks?
Answer:
A. With a joyful heart. Deut. 28: 47 / Joel 1:17.
B. With Loud singing. Ps 69:30. Ps 66:8.
C. In the Dance. Ps. 149:3.
D. With a SEED (Financial / Material). Ps. 50:14 -15.

source: http://aghatise.drupalgardens.com/content/understanding-power-thanksgiving