I can't open your file. If you post a jpg, I can walk you through the analysis.
The Koyo catalog and Shigley's together are pretty much all you need to know about bearings. There are other catalogs that are essentially the same as the Koyo.
You say no force on the shaft, then the displacement is going to be from a uniform loaded beam deflection. The load is from the weight of the shaft. This explanation of that calculation is a good as any: http://www.engineersedge.com/beam_calc_menu.shtml
Typically bearings are treated as simple supports, regardless of the bearing type.
Sizing will probably not be an issue, because any bearing big enough to hold the shaft will support the shaft weight easily.
You can get the radial loads on the bearings from these types of calculations: A tutorial on how to calculate the support reactions of a simple supported beam | Bending Moment and Shear Force Diagram…
It seems like you are saying there is no axial load. That's good, because the problem is a little more complicated (but still perfectly solvable) if there is an axial load.
create splitlines where the bearings will go
apply gravity load
fix both split lines
but this will basically be equivalent to a quick FBD
you can go further by applying other loads or swapping out the fixed bcs for bearing connectors