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How can I have an estimation of the costs involved in using the smart contracts ?#

You can refer to the page Contract Costs for a breakdown of the estimations.

What is gas ?#

For more information on Gas and Gas Prices, check out this article

What is the theoretical storage limit of a smart contract?#

It is 2^261 bytes. Check out this stackoverflow post for more information.

Can I create multiple TXT records under the same domain/subdomain?#

Yes. You can make use of multiple TXT records to point to multiple Ethereum addresses (e.g. document stores or DIDs). Keep in mind each TXT record should only contain one Ethereum address record.