As for 3M clay, try their website,
www.3M.com.
I have only used 2 of these brands of clay. Clay Magic is very good, and I'm presently using Pinnacle Poly Clay. Also very good.
Nothing could be easier to use, than clay. If you get the lubricant, just spray on a liberal coat, take a flat piece of clay, and rub in a bumper to bumper manner covering several square feet at a time. You will feel how the surface will get very slippery as the surface is cleansed of any surface debris. When you are satisfied, just wipe the finish off, and move to the next area or panel.
Keep kneading and turning your clay to keep it clean. We don't want any scratches. When it's dirty, discard it. You should get several cars out of a piece.
Some clay comes in 1 chunk, and some like Pinnacle give you 3 small bars. Just keep it clean.
Some folks use a liberal mix of auto shampoo and water, or QD lubricant, as the medium instead of the regular clay lube. Some folks even clay as they wash their vehicle. All of the above are your choices. You will find a system that works for you.
When your done, give your vehicle a good wash, and your ready to move on. I think once or twice a year is sufficient to clay your finish. I do mine in the spring, and the fall. Again the choice is up to you.
I'm sure I've forgotten several tips, but other members will help you out.
Welcome to the Forum. It's the best place on the web to get that super shine on your vehicle. Enjoy!