This document discusses agile planning techniques, including estimating story sizes using planning poker. It recommends that the product owner have all stories sized before the first sprint using planning poker to estimate relative sizes quickly and without bias. The product owner can then use these estimates to create a release plan and update it during sprints as new stories are added or split. It also discusses when stories should be re-estimated, such as when their relative size changes or when goal-level stories are split into smaller stories. Velocity is also discussed as a way to estimate future sprints based on the team's past performance.