Build multi-tab Spreadsheet Template that will be converted into web-based app later on.

This is multi-stage project. On the Stage 1 I need to Create a pricing spreadsheet template with 3 tabs. Tab1 will be a summary tab that will pull out some key-field values from Tab 2. Tab2 will be data-entry sheet (about 100 lines) with some basic formulas/lookups. Tab3 will have some static data (about 100 lines) used for calculations/looksups in Tab2. Users should be allowed to enter data only in specific fields on Tab2 and Print/Email Summary Report from Tab1. Admin will be allowed to edit data in Tab3. Fields in Tabs 1 and 2 will need to have extensive formatting to make them user friendly and to protect from accidental deleting/modifying by Users. Would like to use Google Spreadsheets if possible. The spreadsheet should be easy to add/modify by admin. I'm looking for help with the first stage right now. The info below is just to give you an idea what is the next stage will be. ================================= Stage 2. Add about 6 more Tabs (much smaller than Tab2, 20-50 lines). Convert this spreadsheet to dynamic web-based application. Stage 3. Continue adding more functionalities and updating the existing ones.