What's the best way to implement a MFB low-pass filter?
That would be quite a good ;-) exercise to find all the component values.
The DC gain is A0 so that means R2/R1 = 2. You can just fill in a value and see what you get as there is no single solution, only the ratios and products of the component values matter.

You probably don't know that this type of filter looks like a Sallen-Key filter but it's not ;-) So after a bit of Googling I found this.
Which makes things a lot easier.

Nontheless if you want to become a real EE, you should at least once design a filter (even if it's a simple one) completely from scratch using some tables from an old book like the one written by Mr Anatol I. Zverev.
After doing that, just use an online calculator ;-)