Anyone know any resources to help me install my widget when my plugin is activated?
By “install” your widget, I’m assuming you mean “automatically add the new widget to the sidebar for your user after the plugin gets ‘activated'”. (Because if you activate the plugin, which also contains a widget, your widget should be visible in the widgets area immediately, without any more work needed).
Jordan Bosch has a great write-up on how to create a plugin that automatically assigns a widget to the sidebar without intervention from the user.
If you’re already familiar with plugin / widget development, that should get you going pretty quickly. Good luck!
If you coded it correctly, your widget will automatically be registered upon activation, but there’s no good way to automatically place it in a sidebar. The theme might define multiple sidebars, so you won’t know ahead of time which sidebar to place it in to.