The decision on which journal to submit your manuscript to for publication is multi-faceted. Some criteria you might want to consider include:
Below you'll find links to resources that might help you with your decision. But also, don't be afraid to ask for advice! Talk to your colleagues, advisors/mentors, librarian, etc.
University of Colorado Denver librarian, Jeffrey Beall, blogs about the risks of scholarly open-access publishing. He writes about issues such as "hijacked" journals (where someone pretends to represent a well-known journal in order to collect article submissions and fees), "predatory" journals (publications with questionable practices or poor journal standards), and plagarism. He also keeps lists of the journals and publishers that meet his criteria for being labeled "potential, possible, or probably predatory."
Do you have any grants from the National Institutes of Health? If you do, you need to be aware of the NIH's mandatory Public Access Policy, which stipulates that all investigators funded by NIH grants must submit electronic copies of their final peer-reviewed manuscripts when accepted for publication. The manuscripts must be publicly available no later than 12 months after official publication.
Please refer to these resources for more information: