Journal Citation Reports (JCR) to find impact factors. JCR is available from the Scott Memorial Library list of all databases from 2008 to the present.
JournalGuide.com is also a good resource for learning more about individual journals. In addition to listing information about publication speed, fees, and SNIP (Source Normalized Impact per paper) it notes whether the journal has been verified as legitimate. Verified journals have been confirmed as included in at least one high-value index or vetted by more than one subject specialized index.
To assess a journal or publisher’s credentials, use the Think, Check, Submit checklist, a cross-industry initiative to help researchers identify trusted journals for their research.