If you write fiction or general non-fiction, you will find that most publishers will not even look at an uncommissioned typescript unless it comes via an agent.
For most other categories of writing, you may well find it easier to approach publishers direct rather than trying to interest an agent.
If you are going to try to find an agent it is better to do so before approaching publishers with the typescript.
How do I find an agent?
A comprehensive list of agents can be found in The Writers' and Artists' Yearbook. Full details on how to submit your work are given in the book.
The Society of Authors cannot recommend specific agents/agencies, however any agents listed in the Writers' and Artists' Yearbook with an asterisk are members of the Association of Authors' Agents, which means they uphold a code of good practice. We advise independent research in addition to using the Yearbook.
Where it would be helpful, members are encouraged to consult the Society about any specific offer they receive.