Although there is no one source that can answer all the questions that arise in this decision making process, the following provide an excellent overview of the law journal article submission process.
Scholastica
Scholastica offers a submission service to a number of law journals and non-law journals. Please note that The Catholic University currently maintains an institutional subscription to Scholastica, thereby allowing all faculty members to submit their articles using this service. To register for this service you must sign up using your @law.edu email address. More information on using the system as an author is contained in the two guides below.
Contact Beth Edinger if you have questions about using this service. Please note that ExpressO ceased operation in June, 2021.