Generally, if you go to an internship as a sophomore, you will not be exposed to practical things, and you may order more files. However, if you want to feel the lawyer industry or are interested in being a lawyer, you are still advised to go to an internship.
The details can be introduced by relatives and friends, teachers, etc. If there is really no such relationship, you can call various law firms. If you don't want a salary, the firm still welcomes interns.