"Write the present day meaning of the expression and explain its origins"

I really need help with these sayings. thank you so much.
"Write the present day meaning of the expression and explain its origins"
1. A chimerical Scheme

2. An apple of discord

3. In the arms of Morpheus

4. Beware of Greeks bearing gifts

5. Hydra-headed evils

6. As wise as Nestor

7. Difficult as the judgment of Paris

8. Between Scylla and Charybdis

9. Sinon

10. An Icarian Adventure

11. A task of Sisyphus

12. Janus-faced facts

13. an Augean Task

14. A Cassandra Utterance

15. Bellerophonic letters

16. the thread of Ariadne

17. To be unable to bend Ulysses' bow

18. The face that launched a thousand ships
THANK YOU SO MUCH!

If you like Greek mythology so much, you really should get a book, buy one or take one out of the library. There are dozens that will tell you all you need to know. It's generally pretty easy to figure out figurative uses, once you know the mythological meanings. Some of the phrases you use seem a bit unusual. I would expect, for instance, THE apple of discord, a Cassandra-like utterance, a Sisyphean task. I would not expect to see an Augean task, but rather a Herculean task, like cleaning out the Augean stables. Bellerophonic letter? Maybe Bellerophontic, but what would they be? Bellerophon, besides being a much misunderstood character, was the fellow who tamed Pegasus and drove him around. Someone may tell you what Bellerophontic letters are, but not me. If you don't want to read a book on mythology, just look up the relevant articles in an encyclopedia. SS