We are a product based software development company and looking out to explore Bitbucket

We are trying to migrate from Clearcase to BitBucket. This is first time we are exploring and need complete details and steps to carry out this task.

Other relevant queries:

1. Is there any size limit for Private Repository?

2. How to get the History along with source code from Clearcase into Bitbucket?

3. We need to have a call setup for understanding this activity and discuss further on Pricing/Licensing/Support etc.