To help achieve your goals, some time spent at the SketchUp Campus and at the SketchUp - YouTube channel will be very worthwhile. Both sites are from the SketchUp team. On the YouTube channel, pay attention to the Square One Series. It covers the basics for each tool.
And in situations like this, instead of creating the geometry and then discovering that you can no longer work because it has become a very heavy file, use textures.
It’s something advanced for a beginner, you should start with something simpler, and learn first the native tools, that shape is better to do it with plug-ins, but to know how a plugin works you must know the basics.
Start modeling objects of your home or office, like a TV, a desk, a basic chair, maybe a glass a bottle and then try to model more complex objects using native tools.
Mithai.s sir, thank you so much. You always somehow solve my query. I really appreciate sir. Can you please show a demo sir? On how to make that form? Pls.