@HOPE2 The answers are still the same as those given by Susan and Jeff.

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What I understood: I have to attach 8948 and since most of original forms got changed (which I dont know already e-filed or mailed) because of 1040-X,  I should attach all of  new 1040 pages.

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Why would you not know whether the original return was e-filed or mailed?  Your client should be able to tell you.  If it was e-filed, your client would have signed a F.8879.  If it was filed on paper, there would be a F.8948.  Or your client could simply confirm with the preparer.  And you can always try e-filing first before resorting to filing on paper.

Also, as you have been advised, you do not need to attach all new 1040 pages, only the forms, schedules, and statements that have changed.

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Couple should sign and date handy on page 2 of 1040-X, how about tax preparer? Should I sign and date handy writing or typed-font signature and date are fine?

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If your clients are to file on paper, they will need to sign and date on page 2 of 1040X, which is their amended return, not the 1040.  You can also need to sign and date on page 2 of 1040X only; your typewritten name is acceptable as your signature for this purpose.

Hope this is clear.