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But I am currently in Canada. If I am applying from here only. ?

You, as a spouse of inadmissible primary/secondary applicant can visit Canada. However, when you apply for PR, you will also be deemed inadmissible because of your spouse's inadmissibility.
 
Okay if I go with first case, can I remarry my husband? We haven't applied for any visa or TRP for my husband during his Inadmissibility.
 
Okay if I go with first case, can I remarry my husband? We haven't applied for any visa or TRP for my husband during his Inadmissibility.

Of course you can re-marry your husband, no one's going to stop you. However, whether you'll be able to sponsor him for Canadian PR or not, or whether your sponsorship will be accepted by IRCC is a different question.

Considering the complexity of your circumstances you wish to go through, you should consider hiring an immigration attorney.
 
Hey, can you tell me if my open work permit expires. Can I extend my visa in Canada for applying express entry.?
 
Hey, can you tell me if my open work permit expires. Can I extend my visa in Canada for applying express entry.?

You can apply for express entry even while you are not in Canada.

Extension of permits/visa's is independent of your application for express entry.