A polished edge has a glossy finished look and is a better choice for visible pieces such as shelving or tabletops (flat polish is standard). A seamed edge is for safety and has an unfinished appearance which is ideal for non-visible pieces such as framed mirrors or a non-decorative piece. Beveled edges can go on mirrors or glass, and the width of the bevel is up to the customer. 

If you prefer rounded corners on your glass, there are a few options shown to the left, however if you have a specific radius corner in mind we would need a pattern/template of the corner.

Depending on your glass usage, you will need a specific thickness of glass.
1/16" is often used for light window repair such as in a garage.
1/8" is often used in framed mirrors, stationary windows or cabinet glass.
1/4" is often used for wall mirrors, and glass to protect existing furniture such as a tabletop.
3/8" is often used in shelving for heavy objects.
Glass heavier than 3/8", such as 1/2" is used as pieces of furniture.

Depending on your window, you will have a single or double pane.
In a double pane window, the glass panes are spaced apart and then sealed which leaves an insulating air space.