To add to your "mindset for freelancing" and to address the OP's question of "how do I get clients," I think one of the big assets for a freelancer is insider k

To add to your "mindset for freelancing" and to address the OP's question of "how do I get clients," I think one of the big assets for a freelancer is insider knowledge of how businesses work, and how business processes work. You don't have to actually be an insider to get this knowledge, but you're going to have a hard time solving business problems if you a) don't know what they are, b) don't know the current state of solutions, and c) have practical ideas on how you can fix this using magic computer sauce. For this reason, I'd +1 the suggestion to look for a job as a webdev. Could be great work experience, but more importantly, good experience interacting with businesses in a B2B setting, seeing how they tick, and learning about the overall process of selling to a business.