That's a big ask.

As a first step I'd suggest you review the UKVI webpage called -
Apply to join family living permanently in the UK

Follow all the links applicable to your case.

To quickly cover your concerns:-

1. There is no interview at the Embassy. Take a look at the VFS webpage called How to book an appointment
It's very rare to be called to the Embassy for an interview.

2. Yes. A signed print-out of the online submitted form together with Appendix 2 (Financial Requirements ) and all supporting docs must be presented to VFS at the application centre during the appointment.

3. If you choose to use cash savings alone to meet the financial requirement then you only need to present those documents needed to prove that the funds have been in your ownership and your control (or of the applicant or jointly) for at least the period of 6 months prior to the date of application.
You'll need to show a minimum of £62000

4. The application cannot be submitted without an approved English Language pass certificate and an all clear TB screening certificate.
This is all covered in the provided link above under point 1

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