May be is a good idea to plan a structural moral delibaration, e.g. four times a year, where a team of professionals try to discouver moral questions en dilemma's'and arguw about how to cover these.

In the ethics of care are several examples of how to do this. 

Always tell the truth

- naturally ;-) 

Speaking as an ethitist, and from a philosophical perspective, I feel that you woud benefit by first grounding youself in the basics of moral and ethical conduct.  you ca do this by reading Utilitarianism by John Stuart Mills.  It is a short book and a relatively easy read.  Mills discusses ethical dilemmas and suggests ways to cope with them.  He gives an essential code to live by.  Use his code to to be prepared for for whatever situations may present themselves.  I would also refer you to an important article titled Resolving Ethical Dilemmas -  National Association of Social  Workers.  This article contains valuable information that answers your question directly.

I work in medical ethics, rather than social work ethics, but there are significant similarties, and I work in areas of crossover.

There is no easy answer to your question.  I would hope that in your professional training you will have some some exposure to ethical issues in social work, and will have some education/teaching about how to identify and deal with ethical dilemmas.

Familiarising yourself with classical ethical theory, as suggested above, might be useful to some extent, but I would caution against diving into classic philosophy as your first port of call.  Mill, for example had a particular take on ethics, which is a useful tool, but certainly not a bible to live by.

Learning about ethical theory and learning about how to identify and resolve ethical issues in practice are related, but different.  I would strongly advise you to speak to your tutors and professional colleagues.

One book you may find very useful, with cases and analysis, is: 'Practising Social Work Ethics Around the World: Cases and Commentaries', edited by Sarah Banks & Kirsten Nøhr. Routledge, 2013.

The UK has a code of ethics for social work, written by the  British Association of Social Workers, which may be useful: http://cdn.basw.co.uk/upload/basw_125523-5.pdf .  This may not help you resolve ethical dilemmas but is a good starting point when looking at core professional values.  There are similar codes of ethics in different countries.

As a general intro, this book has had a reasonable reception, from what I can gather: 'Values and Ethics in Social Work Practice', Lester Parrot, London, Sage, 2014, pp. 216.  I have not read it myself.

A really good, and accessible, introduction to different kinds of ethical theory, with lots of practical and applied examples, is James Rachels' 'Elements of Moral Philosophy'.  This book is not about ethics and social work, but is an excellent introduction to different ways of thinking about ethics.  It is currently in it's 8th edition, and is very expensive, but earlier editions are just as good and can be picked up for a few pounds (sterling) on the web.

I hope you manage to develop your learning in this area. Again, I really would recommend that you speak to your tutors about this - they will be in the best position help you.

there are many theories of ethics...find one which suit your understanding and capabilities then you can apply it in your social works....

I am a muslim so that we have our own code of ethics. however it does not mean we  reject other theories...