Hi there,
I am also doing DA. Some of the books that I found useful to start with are:
1. Analysing Text and Speech: Content and Discourse Analysis by Fran Tonkiss in Researching Society and Culture, ed. Clive Seale.
2. Conversation Analysis and Discourse Analysis by Robin Wooffitt in Researching Social Life, ed.Nigel Glibert.
3. Chapter 12 by Alexa Hepburn and Jonathan Potter and Chapter 13 Critical Discourse Analysis of Ruth Wodak in Qualitative Research Practice, eds. Clive Seale et al.
4. Conversation Analysis:An approach to the study of Social Action as Sense Making Practices by Anita Pomerantz and B.J. Fehr in Discourse as Social Interaction, ed. Teun A. Van Dijk.
Hope it helps.
SS