A Plan is a subscription package with pre-installed modules

This depends on your type of business. Most retail shops (supermarkets, restaurants, drycleaners, pharmacy shops etc) will only need the Starter Plan. But your business may need certain modules that are only available in specific plans. For example, a manufacturing company will need the manufacturing module which is only available in the Gold Plan

OdooSME is a monthly service. You can cancel or upgrade at anytime but we currently do not offer downgrade options

Yes. You can use your company name as a sub-domain on our domain name eg yourcompany.odoosome.com. Or you can use your fully qualified domain name eg yourcompany.com