The first nocturne (9/1 Bb minor) is beautiful and pretty manageable. PS: your English is fine.
What about either the posthumous c# minor or the late e minor one? While they pose musical difficulty to some extent, they are quite manageable technically.
op27/2 is indeed one of the hardest nocturnes (but also the most beautifull one), so it might be better to try a easier one first. You could start with op9/1, 15/3 or 72/1. BUT the hard part of Chopin's nocturnes in general is, that they often have small parts wich are technically difficult. So they might look not that difficult, but it takes alot of technique to get them to performance level, to truelly master them.Good luck,gyzzzmo
i'm with the general opinion: choose between opus 9 number 1 or 2. both are overplayed, but chopin is already overplayed, early 19th century music is overplayed, piano music is probably overplayed... just stay away from opus 9/3... btw, opus 27/2 is a wonderful piece of music. that's a cool idea for the future. about your written english, relax: the non-natives write as they can (i include myself here) and most natives write worst yet... in the end, disregarding a misunderstanding or two, everybody comunicates.
hm. I'm not sure I'd be willing to put "levels" on the nocturnes - no doubt some are better to start with than others - 9-2 sort of "introduces" you to the way Chopin does bass parts if you haven't done much Chopin. Plus it's a very pretty piece! But the others are correct - they are all difficult to make into truly beautiful music - even if the "notes" aren't that tough to pull off. Just my 2 cents.