Help- Looking for some pointers or sources to understand the different concepts of Urban Planning and Architecture

Hello, I am a high school student that has chosen to work on a project that heavily involves 3D design and urban planning, where I have to create a city that fits a certain list of criteria that I set for myself. My product goal is to construct a 3D digital city plan with multiple economic access points and an emphasis on infrastructures as well as community-oriented design. My city plan will attempt to deal with many of the issues observed in cities nowadays through the creation of more opportunities for affordable housing, better organized roads to avoid congestion, walkable areas and the creation of communal space to improve social well-being.

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So far I have been working on figuring out the technical part of the design (ie use of 3D rendering software) but I've hit somewhat of a roadblock in doing research for the planning as I am a bit lost and don't know where to start or what basics to understand. So I came to this subreddit for some pointers on where to start or what kinds of trends to examine and incorporate into my design. Thank you for any help I can get.

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(Note that this is somewhat of a small project and I am new to this kind of work. Information or tips related to software such as sketchup is also welcome)