What's the best way to apply for H4 & EAD if my L1B ends in Feb 2025 and my husband has an H1B?

The conditions for H-4 employment are that the H-1B holder either has a labor certification pending for at least 365 days or has an I-140 preference petition approved. Assuming that one of those conditions is met, you could apply for both benefits concurrently with forms I-539 Application to Extend/Change Nonimmigrant Status and I-765 Application for Employment Authorization. You can make the application as soon as the condition is met by your husband since the EAD is open market under which you can work for any employer including your present one. Due to the limitations of the Lawyers.com Forums, Alan Lee & Arthur Lee, Esqs.’ (the "Firm") participation in responding to questions posted herein does not constitute legal advice, nor legal representation of the person or entity posting a question. No Attorney/Client relationship is or shall be construed to be created hereby. The information provided herein by the Firm is general, and requires that the poster obtain specific legal advice from an attorney. The poster shall not rely upon the information provided herein as legal advice nor as the basis for making any decisions of legal consequence.