Here are a series of videos posted by CaseWare Analytics that will walk you through the basics for V10 of IDEA.
IDEA v10 Tutorial Chapter One Introduction
IDEA v10 2 Managing Projects
IDEA v10 - 3 - Importing Access Files
IDEA v10 - 4 - Formatting Data
IDEA v10 - 5 - Random Sample
IDEA v10 - 6 - Direct Extraction
IDEA v10 - 7 - Importing Text
IDEA v10 - 8 - Visualization
IDEA v10 - 9 – Summarization
IDEA v10 - 10 – Stratification
IDEA v10 - 11 - Pivot Table
IDEA v10 - 12 – Joining
IDEA v10 - 13 - Append Field
IDEA v10 - 14 – Duplicates
IDEA v10 - 15 - Identify Gaps
IDEA v10 - 16 - Key Value
IDEA v10 - 17 - Functions
IDEA v10 - 18 - Designing a Report
IDEA v10 - 19 - Action Fields