SciFinder is useful as a means of finding articles based on subjects in biology and chemistry because it has different search capabilities than Scopus. Rather than emphasizing citation analysis, SciFinder instead gives you the option to search for research based on the materials used. Look for "Link to Other Sources" to find the full-text of the articles you want to read, and create a "Keep Me Posted" alert to get notifications when new research on your topic is published.
Scopus tracks how much papers are cited, and it is by this citation analysis that you can get a sense of what people have written and what, based on the citations, are considered foundational papers in the field. You should do your search in both to make sure you're catching everything, as, while there is a fair amount of overlap, they draw from different collections of publications.
Look here for access to journals provided by the journal publishers. Searching a publisher database can be more useful than one of the broader-topic databases if you know that the subject you're looking for is a major focus for a particular publisher, as these databases will have current coverage of some journals we may only have with an embargo in other databases.