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I think the best way is through behance.net; in behance you can find the most competetive interior designers around the globe how to creat their own portfolio mostly in creatives to follow in field of interior designers. so find out more on behance..
I would recommend behance.net
Include all your work from start to plan your design to implementation, especially that you already think is most special
answer to your questions:http://www.wikihow.com/Make-a-Portfolio-for-Interior-Design
1) Don’t be afraid to the standards for your own work very high.
2) Think about your portfolio early and often, just don’t cater to it.
3) Make your portfolio uniquely you, just don’t try too hard.
4) Ask for help
5) No detail is too small