I want to take a photo on my Mavic and have it printed into a large photo and framed on my wall.

Just wondering if anyone can help/offer advice.

How big will I be able to go before it is too pixelated? Should I shoot with specific settings? (ratio, raw, style etc.) Will it work well with Mavic's camera or not?

TIA

The camera is 12mpix - so that is slightly larger than A4 in 300 dpi and about A2 in 150 dpi.  150 DPI is enough for normal poster view distance. I would say about minimum 110 dpi for high quality print if you have the right "print engine" with great un-sharp tools like QImage.