This link allows you to download a free copy of netlogo to your computer. How to Install NetLogo gives step-by-step directions for downloading netlogo to a Windows-based computer (directions are similar to those for a Mac-based computer).
StemCCM is a website dedicated to teaching basic coding skills. It has many videos and exercises which will increase your coding skills.
The Netlogo User's manual has a dictionary of the coding language as well as three tutorials for teaching you how to use netlogo. The NetLogo Cheat Sheet has a list of basic commands and coding examples.
The Netlogo modeling commons and Models Library have previously published netlogo models organized by topic which may serve as inspiration for the models you build.
This link takes you to NetLogo youtube instructional videos.