(Submitted by: R. D.)
A. Your questions, although they seem simple enough, are actually difficult to answer since summaries aren't always 100% accurate because qualifiers get omitted. That said, I offer the below synopsis of who God is and the Bible's main theme for your future Bible studies.
Who is God: God is a personal, all-powerful, all-knowing, omnipresent, loving spirit Being who created the material universe as something separate from Himself. God is composed of two spirit Beings at present (cf. I John 3:1-2; John 17:20-23; 10:30-39). His love for humanity is practically demonstrated directly by His willingness, as Jesus, to die painfully on the cross to erase the sins of all people (John 3:16).
Theme of the Bible: The Bible is the "Manufacturer's" instruction booklet telling human beings (the Creator's highest creation) how to live happily in this life and how to live forever in the next by revealing specifically how we should obey and have faith in Him. The Bible reveals how God is reaching down to humanity to redeem us from sin and spiritual ignorance and how we can be reconciled to our Creator, and thus have true meaning in this life by pleasing our Creator.
