Check out the book "The Way of a Pilgrim". It has some very practical instruction in in on how to say the Jesus Prayer, what the prayer is, and why to say it. Here's a link but I'm sure you can find it for free online: https://www.amazon.com/Way-Pilgrim-Continues-His/dp/0385468148
I really cannot recommend this book enough, it has changed many lives and is very practical.
A Course in Christian Mysticism by Thomas Merton is a great place to start. It is written in clear, contemporary English and will introduce you to many important references that you can follow up on according to your interest.
https://libgen.is/book/index.php?md5=39433C38C464A7F5C9D9ECE2AE84ED10
Worship by the English language definition is fine, but not by the Catholic Church definition, where worship is reserved for God alone.
Mary is super-duper important. Read this if you can: https://www.amazon.com/Mystical-City-God-Popular-Abridgement/dp/0895550709
I converted to Catholicism after reading it.
Check out: The Path of Centering Prayer
Never read the Pengiun edition but the original was written in middle english and translations of the text can vary widely! The first copy I picked up was practically unreadable for example.
The translation by William Johnston which also includes the equally amazing "The Book of Privy Counseling" by the same anonymous author is the one to get in my opinion and the most commonly recommended version I see from those who have made a deep study of the book (William A. Meninger for example).
A couple of great things about the KJV:
1) You get to use Strong's concordance to look up the definition of every word. This carries over to programs like eSword which is very helpful: http://www.e-sword.net/ There's also an app which I use a lot.
2) The English we speak was developed around the same time the KJV was written. For a few generations, this would have been the main printed literature for English-speakers. It's at the root of our language, so it's easy to learn.
Try comparing versions yourself and see what rings true for you. But do give the KJV a chance if you're looking to get into the multidimensional poetry of the sciptures. Other versions may be like diamonds in the rough, but the KJV is like a glorious diamond cut to perfection so the facets reveal all kinds of meaning hidden beneath the surface. The other versions seem flat to me.
Cynthia Bourgeault's The Heart of Centering Prayer: Nondual Christianity in Theory and Practice, has an excellent commentary on the Cloud of Unknowing. And her book on Centering Prayer had a tremendous influence on me.
Read The Mystical City of God.
You'll find no greater humility to imitate than that of the Blessed Virgin (other than Christ Himself).
This book changed my life.