Hi Sreenivas,
According to your requirement, I think Office 365 Business Essential plan is a good option. This plan provide all SharePoint Online feature and doesn’t include Office desktop applications. The cost for the users in the US is $5.00 user/month for annual commitment and $6.00 user/month for monthly commitment. You can also find the details of other plans here: Compare more Office365 for Business plans.
Thanks,
Eric Yang