Buying used rail R50 & R65 CIF price to Oman

We are interrested in buying used rail R50 & R65 CIF price to Oman.

We need an offer with the following details:
How much is the CIF to Oman?
How many days to reach Sohar Port in Oman?
What is the term of payment?
How many Tons are the minimum order
How many Tons are the maximum order
The CIF includes the clearance in the custom in Oman?

Please let me know the assurance of delivery and arrival of rais in Oman as I have a client who wants to buy 500,000 Tons of Rails, first order, then if this is successful, 500,000 will be ordered.