Work experience/ internships are a must in the field of law. Before looking for an internship, look within yourself. Look at your past achievements and failures, prepare a proper SWOT Analysis for yourself, i.e. find out what are your Strengths, weakness, opportunities and threats. After that start building a resume, as you said, you haven't interned anywhere before, mention each and every skill! Sometimes even a small talent could help you fetch a great internship. For instance, if you spend a lot of time on social media, this could also be used as a skill as there are many Instagram/ Facebook pages that require active social media users for the purpose of social media marketing or handling their social media handles. So, make sure to mention what are your skills and how you could be an asset to their firm.
After that, make a routine to apply for an internship to at least 10-15 companies/ law firms a day. You can apply at Internshala, lawctopus, and other sites. You can personally apply for an internship with district/ high court lawyers of your place.