Created mostly from free objects from blendswap.com and Davinci Resolve.
Character from Blendswap (Used robot head, robot hands, and suit) and with Mocap from Mixamo.
Modeled the small building in the mid ground with modifiers.
DaVince Resolve How To
How to save Stills from Davinci Resolve 17
How to Composite a 3d object into a scene. He talks about how to match the blur, color correct, add masks for lighting.
There will be a list of plugins here linking to reviews.
Blender is a powerful program and if you don't have a fast enough rig, you won't be able to do the things you really want to. Forget about simulations, or large scenes.
Get 32gigs of ram or more, (ddr5 ram just dropped in price), Get a VideoCard with 12gb of vram or more, get a large M.2 drive, and an 8 to 16core Processor.