I have been looking around for some new pieces to try, and I didn't know what level/how hard these pieces are:

Nocturne in Bflat -- John Field
Rondino -- Antonio Diabelli
Poem -- Zdenko Fibich
Largo -- Handel
The Cascades -- Scott Joplin
Having Fun from Op 27 (no 70) -- Kabalevsky
La Tambourin -- Rameau
Song of India -- Rimsky-Korsakov
Album Leaf op. 45 no. 1 -- Alexander Scriabin
Serenade -- Schubert
The Beautiful Blue Danube -- Johann Strauss

what rcm level are they, how challenging are they, and I am currently level 8, do you think they would be an okay level for me? I know there is a lot, but if you know even a few, please help? Thanks so much!

Although I can't answer your question exactly, it would seem to me that if you are at level 8 with the Royal Conservatory of Music of Toronto (as I am) you should be able to play all of these pieces. I think that Nocturne by John Field was in an older version of either the level 7 or 8 repertoire.