D7-Visa - Any advice is greatly appreciated!

I’m just getting started in the process (less than a week in planning so far) but I’m starting to get a clear understanding of the steps and requirements. I’m a little confused about income requirements. I have $45k USD passive income and I’m looking to immigrate with my wife and possibly my kid (20). I don’t have a great deal of cash on hand as we recently spent a good deal of our savings on a wedding ceremony. What do I realistically need to have in savings to make things go smoothly in the application process?

It’s worth noting that I also make more than $40k USD (in addition to my passive income) at my remote job. I’ve held this job for more than 4 years and don’t intend to leave their employment.

Any tips or tricks would be appreciated. Maybe just “things I with I knew right from he start” type of stuff.

Thank you!