Hello Sld2012, Welcome to the Community page,  have you read the Limitations article & post migrations article on Move My Books as all the answers are on all those articles for you. 

So for question 1, you have access to the Export Tool, which is now live so you can see all reports for all FY's you have on QBDT.  - It would show all the balances entered up to, to the date you migrated.

For Question 2, is completely wrong, 

Basically MMB do not convert Multi Currency. It converts all into home currency which will be GBP.

This is correct and you would not change any of the transactions.

The post migrations tasks advise how to proceed with MC after conversion. 

I would recommend that you read through these 3 articles

https://movemybooks.co.uk/move-to-quickbooks/limitations-of-service-quickbooks/

https://movemybooks.co.uk/foreign-currency/

https://movemybooks.co.uk/move-to-quickbooks/post-conversion-tasks-quickbooks/