Any Advice Welcome

I've recently left work to persue a career as a freelance graphic and web designer, If you’re currently a freelancer or running your own small business, I’d love to hear your top tips. These could be anything from productivity tips, to accountancy tips – tips about finding work to tips about keeping organised and focused. Is there a great bit of software you use or a process that you swear by. Is there something you know now that you wished you’d know when you started? I’m all ears.