Help newbie to decide which kit and other questions

[jiwaus]

Hi everyone...I like to thank you for the opportunity being member here. I am super newbie to detailing...

I have following products for several months...Nothing fancy...They are all M brand I got from local auto store and walmart

Crystal Car Wash

Deep Crystal Polish

Clay Bars

Quick Detailer

Deep Crystal Paint cleaner

Ultimate Compound

Swirl X

Scratch X 2.0

NXT Tech Wax 2.0 Liquid

Microfiber towels

My problem is I don't know which kit to buy now. Because current budget issue, I am looking at Porter Cable 7424 Complete Starter Kit, Porter Cable 7424 buffer, Porter Cable power tools or Porter Cable 7424 & Foam Pad Kit - Car Buffer

Question about Grit Guard: Can I only use one for washing bucket? or I have to use two guards for better result.

I planing to remove swirl marks and scratchs on 2009 Black Subaru Forester

But I also read lots of posts about Subaru's soft paint, I am kind of afraid to use Porter Cable on my car

Welcome any suggestions
Thank you