I am not sure whether I should be someone to advise on this as I am a beginner.
I bought a pair of these fins https://www.amazon.de/gp/product/B09P3JYC8R/ as I read that one should pick short and flexible ones and I am happy with these fins. As for paddles I bought https://www.amazon.de/gp/product/B094JZ6DW3 (Speedo) and they do work.
Again, I actually don't have experience with other paddles and fins (well, I have some fins for snorkeling but haven't used them for a decade or so, they are of course not the ones I would use in a pool.
Overall for paddles, they really increase the stress on everything involved in your arm movement, so I usually only use them for 50 or 100 m and then take them off again.
I would at first use fins and paddles more as technique-guiding tools.