Making Tabs
 

I have designed a worksheet in excel and would like to be
able to set up the sheet so that when I use the tab key
that the cursor tabs directly to the various fields.

I would also like to be able to make it so that the cells
that have nothing in them are not even available to click
on, and just appear as part of the background of the
sheet. I am pretty sure that I have seen this done
before, but I do not know how to do it.

I am not a programmer and am just designing forms on Excel
worksheets.

Thanks for the help.