A digital portfolio is what every designer has. It's your CV, so yeah you need onde of those, but in all honesty it means zero. Want a job in that area? Just work on a diverse portfolio and send to every design agency and their family members, personalized to their focus job. Sell forniture? Visit showrooms, take awesome pictures and design everything for an item and send them. If they like, they'll contact you to have your work in every piece. Just dont go freelance or I'll advise you to follow SNS's instructions.
Work for free until you're worth something. It sucks but it's our reality.