During the transition, the major impact will be that it will consider visitor on the new domain as all new visitors because cookies was created on the old domain

You have to create a calculated metric and use the success event with 2 decimal place into it. Hope this will help.

If you have a single product to pass then you can use the extension in Launch but if you have multiple products then the option is not there. You can use custom code in that case. You can get a brief idea from here

Use the concatenation method here for an easier solution How to Capture multiple query parameters in the s.util.getQueryparam

You can try cognetik as there is no direct connector for Tableau and Adobe Analytics.Reference:http://www.ourpcgeek.com/connect-tableau-adobe-analytics/

In Data Warehouse there is no such option to find the order of pages viewed in Visit. 

1.Yes it is possible2.Yes it is possible and after from this You can use Full processing Data Sources to upload offline data into Analytics.3.For offline:Once the Data Sources wizard complete ,it will provide a template to download and accordingly you can upload data.4.Totally depend on implementati...

There will be no adverse effects.