The more good reality checks you do the better. A good reality check is one in which you really test reality and think about why you are reality checking.

Yes anything that appears frequently in your dreams is a dream sign.

There are two types of dreamguides. A dreamguide is a rank on the forums. If you see a member with a green name they are a dreamguide. But I'm assuming you mean the kind in your dreams. They are dream characters that you can learn from in your dreams.

You can become lucid randomly some times. Or if you are constantly aware you can become lucid every night.

When you have tunnel vision just imagine the dream scene expanding in your field of vision.

The more you sleep the more dreams you will have. And if you keep a dream journal every morning your recall will improve.