- The flutes are labelled correctly, but the stems are very confusing as it is now. Make all stems of the second flute go downwards and all stems of the first flute go upwards.
- Assign it to the second bassoon. It's not uncommon at all to have the second instrument play while the first pauses, and it would be unusual in such a case to have the first bassoon play the lower note of the octave.
- Yes, the players have to look ahead and see to what dynamic the crescendo leads and play the crescendo so that they arrive at that dynamic at the right moment. But sometimes you can also explicitely write "molto crescendo" for a big/fast crescendo, "poco crescendo" for a small one, and "crescendo poco a poco" for a very long crescendo that builds up quite slowly.
One more thing to consider is "orchestra psychology": Musicians often tend to make crescendi much faster and stronger than diminuendi (people love to play loud

), so to compensate you may consider only writing "cresc." or crescendo hairpins fairly late, but bring in your "dim." or diminuendo hairpins very early. But even if you don't do this, it is something that the conductor will generally do on his own, i.e. show crescendi quite late but show diminuendi very soon and strongly. Of course this is less of an issue with a first-class orchestra, but honestly, how many of us get their pieces performed by the Berlin Philharmonic?