What are you looking for?
If you want to do more general subject searching and explore around a topic use Bibliographic Databases (also known as Abstracting and Indexing Services). See the 'Using online resources' tab for more information.
JSTOR contains the full-text of many of the classic journals, some as far back as the 1880s.
If you want to be alerted about new journal issues and tables of contents then sign up for the Zetoc service (see quick guide on this page).
When searching in databases think about your keywords, and synonyms for these words.
Use truncation and Boolean operators.
Your search will develop over time, keep a note of what search terms you have used and what has / hasn't worked.
These databases provide abstracting and indexing services for social science articles and papers:
Citation searching (finding out what articles have cited an article or book after publication) can be done on Web of Science (Social Sciences Citation Index) or for articles published after 1996 on SCOPUS.
Google Scholar also has 'cited by' links but these are not yet fully reliable.
To find articles and books cited within books try searching Google Books with the reference in quotation marks.