3d interior illustration

I have just completed a course in interior design and i am looking to build a portfolio of concepts to showcase to potential clients using 3d illustrations. For now i would like to have 3 images done of a dining area, kitchen/dinning and front corridor. I have very basic information for the work to start, all i have is sketches and pictures of items that i would like to put in the space. I would like to commence the work as soon as possible.