To select a journal:
Read their mission and scope carefully. This will tell you what they are looking for.
Pay attention to word or page limits, if given. An excellent paper may be quickly rejected if it is too long. If you aren't sure whether your paper's length will be a problem, email the journal editor and ask.
Read some recent articles they published to determine whether your work lines up with what they are seeking.
Don't let fear stop you from submitting. The worst that could happen is that they say "no," and the next journal might say "yes."