Clarity on Transition Provision

I am marble and tiles trader who mostly buy from interstate dealer and sale local. I have got some some stock as on 1st June 2017. I have some doubt on the credit that I can avail. Kindly Clarify

1. I have got tiles from manufacturer and Got the excise duty paid invoices.But some tiles and marbles are from interestate traders who have just provided me CST paid invoice.
i. Do I need Credit transfer document for getting input credit. or I just need to sale the item and apply for deemed credit of 60% of Cgst.
in tran1 once and tran2 on monthly basis

2. My state vat return was revised due to some clerical error.Will I face problem due to the revision.

3. Will I get credit of the Entry Tax that I have paid on the stock bought into the state