A full list of amendments for the European Union (Notice of Withdrawal) Bill will be available on Monday - but this is the most up-to-date list at the time of writing.
https://www.publications.parliament.uk/pa/bills/lbill/2016-2017/0103/17103-RL.pdf
If you want Peers to support particular amendments you can get contact details (including email addresses) by visiting this site.
http://www.parliament.uk/mps-lords-and-offices/lords/
