1) How can i create a combo box that stores not the Author_ID, but the Author_Name instead? An Author_ID Control of the Form should be filled automatically after i select the row.
In a multi-field combo box, the bound column is the one that 'stores' the value. You choose this column from the control property sheet. As I recall, the column index is 1 based, not zero. The first left-most column that is visible is the one that is displayed in the control. So the source of the combo has to return the field you want to see, and it has to be the bound column to auto complete, as I recall.
2) How can i make this Combo Box autocomplete for each keystroke i give?
That is the default behaviour if the control has a row source, but it applies to the bound column. So your combo bound column usually has to be a text field, unless you want to auto complete by numbers. Here's more info on the subject, and I recall that it has a means to do this with text boxes too, but it involves code. By the time you read this, I will likely not be able to reply further in a reasonable time frame.
http://allenbrowne.com/AppFindAsUType.html
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Paraphrase of Professor Brian Cox.