Basic Space Clearing is the simplest and easiest version of space clearing to do, so it is the one most people start with. 

There are two sizes of kits available.

The Large Basic Space Clearing Kit includes a large space clearing bell, which can be used to space clear rooms up to 2,000 square feet (approx. 200 m2) and is also the most effective size to do personal belling.

The Small Basic Space Clearing Kit includes a small space clearing bell, which can be used to space clear rooms up to 500 square feet (approx. 50 m2).

Books
You can find instructions for how to do Basic Space Clearing in Space Clearing, Volume 1 and more in-depth knowledge in Space Clearing, Volume 2. 

Online courses
These online courses include videos to help you learn the techniques and ask any questions about them that you need to ask.
Basic Space Clearing
Personal Belling