Access 2007 - queries & printing - form vs reports

In general, forms are designed for entering and editing information, and do not generally work well as reports (although some people insist on printing forms).  Generally you should create a separate report if you want to print your data, although you might be able to use the same query on a form and on the report that applies to this form.
With regard to your specific questions.
1.  Yes, you can sort a form based on various columns using the OrderBy property of the form.  You can do this in either single or continuous view, although it is easier to see when you use a continuous form and can see multiple records at one time.  To do this, you might add a combo box to the header or footer of the form, and set the combo boxes Row Source Type property (data tab) to "Field List", and set the Row Source property to the name of the query or table that the form uses.  Then, in the AfterUpdate event of that combo box, change the forms OrderBy property.  This might look like:

Private Sub cbo_OrderBy_AfterUpdate

    me.OrderBy = me.cbo_OrderBy

End Sub

If you are using a continuous form, you might want to consider disconnecting the column header labels and putting them in the forms headers.  Then you could use the click event of each of those headers to change the sort column and direction.  You would have to put code similar to the following in the click event of each of these labels.

Private Sub lbl_field1_Click

    if instr(me.OrderBy, "Field1") = 0 Then
        me.OrderBy = "[Field1]"
    elseif instr(me.OrderBy, "DESC") = 0 then
        me.OrderBy = "[Field1] DESC"
    else
        me.OrderBy = "[Field1]"
    End If

End Sub
   
2.  As stated before, forms are designed for editing and viewing and are optimized for the screen size and resolution of your users.  Reports are designed for printing, and should be created with readability (landscape/portrait) AND paper size.  Create a report that is based on your form and print it instead of the form.

3.  No.  Use the form for entering and reviewing your data.  Use a report to print or send that information to others.

HTH
Dale

1. Yes. You should be able to right-click any field on your form and sort ascending or descending.
2. Yes, you can set a form to print landscape. This is a design time setting, but your users should be able to select the view they want. However, if you design your form wide for landscape, it will not automatically adjust to print portrait; that is, you will clip part of your form to the next sheet.
With the form open, click the Office button, select Print, and select Print Preview. Click Page Setup and select the Page tab. You can select landscape there.
3. No. If you only give your users a report, they can never do data entry.
Lee