You may find these PDFs useful:
Quick Books Getting Started
Navigating QuickBooks
Creating An Invoice
Managing Expenses
Create Bills and Expense Reports
Invite your Accountant to QuickBooks
QuickBooks Mobile Overview
Connect QuickBooks to your Bank Account
Customising Reports
PayPal for QuickBooks
Get instant insight into your business
Adding Customers into QuickBooks
Adding your Services in QuickBooks
Adding your products into QuickBooks
How to reconcile bank account in QuickBooks
Import bank transactions from CSV