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how should we read Richard III in english?

You will need help, from some book by Cliff's Notes on "Richard III", by Shakespeare. This is because the English language has changed a lot since Shakespeare wrote the play. Many phrases and words no longer are used today. Shakespeares plays are difficult for native speakers to understand because of this. They usually need help from some additional book or pamplet that explains what is happening.

The first thing you should do is visit this site:
http://en.wikipedia.org/wiki/Richard_III_(play)

This will at least give you a good picture of what the play is about.

Hello sepidehjahandideh:

As F D. Maxey writes, you need something like an "annotated" copy of any Shakespearean play, and these contain footnotes which explain the many terms that have fallen out of useage.
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Middle English, is very awkard, even for Native Speakers like Americans etc.

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I have created my own copy of a page of notes for students,
which explains "Hamlet's Soliloquy" [So-----lil----o----Kwee]
for my students. I think everyone in the world should study this Soliloquy.

I think everyone should also study another Soliloquy in Shakespeare's
KING RICHARD II, ACT V, SCENE V:

Sometimes, you can get a bit of powerful philosophy and a general feel about his message, from a single passage. Perhaps at some point, some kind of group study or reading of something by Shakespeare can be arranged.

.---Warm Regards, Bruce