Grieving for the death of a loved one is a long process that takes time and acceptance. The eulogy allows family and friends to say goodbye to their loved one and acknowledge the gift they shared in being touched by his life.
Still others choose to hold a memorial service following the burial in a place special to the deceased. Funeral burial services include everything from the coming together in memoriam and prayer to the burying of the deceased. You won't be expected to express the thoughts and feelings of everyone present, nor to give a detailed account of the life of the deceased.
There are numerous memorial service, condolence and sympathy poems written and easily available. If you attended school with the deceased, you might want to focus on your school days. Poems can range in topics and styles, flowery or overly dramatic poetry is not the only option available.
Again remember, the service and eulogy is held to honor the deceased and celebrate life. Practice delivering your eulogy in front of a mirror or a friend in order that you can see if improvements or additional editing have to be made.