Include benchmarks such as requiring submission of topic proposals, thesis statement, preliminary bibliography and/or annotated bibliography, mid point check-up, or draft workshops with peers. These will:
help clarify the research process
ensure viability/appropriateness of a topic before it's too late
reduce likelihood of plagiarism.
Try to do the assignment yourself to ensure that necessary resources are available
Explain what you mean by "web resources" - Are library databases ok, but Wikipedia not? All are accessible via the "Web."
Collaborate with librarians
consult with a librarian during the planning process
invite a librarian to meet with your class
Encourage students to use Research services, like the Librarians, Tutoriing, and Writing Centers
Encourage students to reflect on the research process
Use a research log to document databases searched/sources consulted