1.Find out the models you want by:

Binoculars by size: Browse left column in which all the models are listed by size
Giant binoculars 60-100mm
35-50 mm binoculars
25-42 mm roof prism

Binoculars by use:
Binoculars for astronomy
Binoculars for birding
Marine binoculars
Military binoculars

2. Use Cost performance formula to screen the models.

3. To start to do business, check walkthrough for buying.