Need help with inventory adjustment details

I  have a "clean" QB Pro 2011 file that  was created using Intuit's procedure for creating a new, clean copy of a company file. It's empty in that there are no transactions, zero inventory, etc. But, the chart of accounts and item list is correct (in that all the accounts and items are there but with zero quantities).

I've learned that there is no way to import a beginning inventory if the inventory items are already in the item list. And I've learned that the only way I can enter my beginning inventory for my new company file is through inventory adjustments.

BUT all of the answers just say "do an item adjustment..." without much more in the way of detail and the same is true of the QB help files.

I need to get my beginning inventory and the average cost of that beginning inventory into QB.

Example: Looking at the item list I see Inventory Item A with a list cost of $2.00, average cost of zero and zero on hand. I need to enter my beginning inventory of 10 units with an average cost of $2.50 as of 1/1/12.

On the inventory adjustment screen, if I just enter 10 into the current quantity on hand, I see a "total value of the adjustment" of $20. That's not right. If I use Quantity&Value Adjustment, I see "total value of adjustment" of $25. But where is that value going? Where is that value coming from?   I also see a drop down list for "Adjustment Account" but I have NO idea what to select here. Do I have to create that account? What kind of account is it? How do I set that account up?

Any detailed help would be greatly appreciated!

Thank you.