Prayer is both simple and complex.
1. It requires faith:
Matthew 21:22: "If you believe, you will receive whatever you ask for in prayer."
2. It's requires being right with God:
John 15:7: "If you remain in me and my words remain in you, ask whatever you wish, and it will be done for you."
3. It requires right motives:
James 4:3: When you ask, you do not receive, because you ask with wrong motives, that you may spend what you get on your pleasures.
4. It requires a clean conscience:
1 John 3:21-22: Beloved, if our heart does not condemn us, we have confidence before God; and whatever we ask we receive from him, because we keep his commandments and do what pleases him.
5. Perhaps the best summary of prayer is 1 John 5:14-15:
"Now this is the confidence that we have in Him, that if we ask anything according to His will, He hears us."
What a wonderful privilege to take our concerns to the Lord.