AsslamuAlikum Rawan, hope you're doing well.
I'm a fresh graduate architect, I use sketchup for modeling all my project (interior and exterior), it's a very simple, easy to learn program. While i was in college I gave some students a sketchup course, So i can teach you in a very simple way.
You can visit my profile and see the modern villa I have post lately, I model it with sketchup and render it with lumion, Also I can show you my interior designs that I model it with sketchup.
I'll be happy if you contact me.
Anoud