In PageHeader/Footer sections, you have access to the data in the Report data scope - check Report Sections in Report Structure article. DataSource can be bound only to data items (the Report, Table, Crosstab, List, Graph, Subreport). Note that the other report items have as data scope the scope of their closest parent data item. For the PageHeader/Footer this is the Report itself. Hence, all TextBoxes in the PageHeader/Footer may use the data bound to the Report. To set the value of a TextBox in the ReportFooter you may use Expressions.
If you want to set data from a different data source, this could be done by introducing a new Table and set it's DataSource property. Please note that it is not possible to use Data Items in this section. You might put the table in one of the other report sections like ReportHeader/Footer, Group Header/Footer etc.
As for the second injury, yes, the Angle property will set the angle of rotation of the text in degrees.
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