Intercessory prayer is essentially selfless, but motivated by love. I'm reminded of Paul's words:
Intercessory prayer takes time and effort on our part. And it can involve a warfare. We certainly want and hope that we're praying like Daniel did, and in his case to the point of exhaustion. Or Epaphras, wrestling for believers' growth and maturity in Jesus.
I urge you, brothers and sisters, by our Lord Jesus Christ and by the love of the Spirit, to join me in my struggle by praying to God for me.
Probably the most important aspect of intercessory prayer is to know that our Lord Jesus is interceding for us. And our intercessions are taken up into his perfect intercession. Because of that, we're encouraged to keep praying our often poor prayers, and those prayers are turned into something very good in God's will.
I have been encouraged, but I know that I am so much a learner in this. What help might you have to offer here, or any thoughts.
(much of my thought came from Richard Foster's book, Prayer: Finding the Heart's True Home, from the chapter "Intercessory Prayer.")