If it’s that new, it’s still under warranty. Take it back.
Or start replacing parts at random.
Pedals are quite easy. Remember the left has a left hand thread.
Bottom brackets generally require more specialized tools.
If you’re not planning to make a habit out of working on bikes, better leave it to a shop.

For the future, remember that WD-40 is a poor lube. Better than nothing, better than spit. But not by much.