Below are some suggestions of further reading, first on class teaching, and then on student study support, as well as links to university handbooks (mostly from the USA).
The first books listed are practical, containing a number of simple 'hints and tips'. Gibbs and Habeshaw contextualise these tips to some extent with ideas about theories of learning.
Gibbs, G and Habeshaw, T (1989) Preparing to Teach: an introduction to effective teaching in higher education, Technical & Educational Services Ltd, Bristol, pp 255. ISBN 9780947885557
Hubbard, R. (1995) 53 Ways to Ask Questions in Mathematics and Statistics, Technical and Educational Services Ltd, Bristol, pp 188. ISBN 9780947885625
For more on running discursive classes see:
Taylor, Rebecca (2002) "Seminars" in Peter Davies (Ed.) (2002) The Handbook for Economics Lecturers: Teaching, Bristol: Economics LTSN. Online at http://www.economicsnetwork.ac.uk/handbook/seminars/
Brookfield, Stephen D and Preskill, Stephen (1999) Discussion as a way of teaching: tools and techniques for university teachers, Open University Press, Buckingham, pp 191. ISBN 9780335201617
For some detailed guidance on assessment, and in particular essay marking see:
Rowntree, Derek (1987) Assessing students : how shall we know them? Kogan Page, London, pp 273. ISBN 9781850913009
Brown, G; Bull, J and Pendlebury, M. (1997) Assessing student learning in higher education, Routledge, London, pp 317. ISBN 9780415144605 In particular Chapter 5, Assessing Essays.
You may want to encourage students to read things for themselves, for example:
Drew, Sue and Bingham, Rosie (1997) The student skills guide, Gower, Aldershot, pp439. ISBN 9780566084300
Colorado State University has a dedicated handbook for Teaching Assistants in Economics.
The following are institutional handbooks for teaching assistants, with some institution-specific detail but with useful general guidance: