Which journals do you or your mentor/colleagues use?
Who is your desired audience?
Are you required to comply with public access mandates for sharing of publications and/or data?
Is the journal subscription, open access, or hybrid?
What is the quality of the peer review process?
Do you have a specific manuscript type in mind?
The journal homepage is going to be the most important source for finding author guidelines and other submission information for authors.
Use these resources to verify claims made on the journal website, and to find indexing, bibliometrics and other details about journal publications.