Note that in addition to below, firms might prefer you to use their Westlaw/Lexis/Bloomberg, so clients' history & work product will be on the firm account and not yours:
Westlaw: You can use "solely for purposes directly related to your law school coursework including pro bono and public service programs, minimal law school-paid stipend work, public internships or externships that are part of your graduation requirements, and/or for bar preparation purposes. Any use in connection with your employment outside of the law school is prohibited."
Lexis: No restrictions
Bloomberg: No restrictions.
Everything else: You have access to HeinOnline, ProquEst Congressional etc, through the library: https://law.uark.libguides.com/az.php .