theology - What overlap is there between the attributes of God in Judaism and the attributes of God in Christian classical theism?

I'm Catholic, not Jewish, but I've always been curious about Judaism. Especially seeing as the Old Testament is largely the same as the modern Jewish bible (with the exception of the deuterocanonical books). I've wondered many times how the Jewish interpretation of the scriptures differs to the Catholic interpretation. Thought I'd start asking questions here and get informed!

I'm wondering what is the Jewish understanding of God. In Catholicism God is said to be simple, which means that God has no parts and is identical to his attributes and his attributes are identical to each other. So for example, we say that "God is love" and "love is God" and "God is justice" and "justice is God" and therefore "God's love is the same thing as God's justice". Is it the same situation when it comes to understanding God in Judaism?

Also do Jews believe in the Creatio ex Nihilo? Which is to say that God created the universe "out of nothing". It also implies that God is completely and utterly unlike the universe. He sits outside it and holds it in existence by his creative powers moment by moment, and if he were to withdraw those creative powers the universe would simply cease to exist. Or do do Jews believe in a pre-existing universe which God lives within, filled with pre-existing matter which he shaped into what we see around us. Or perhaps Jews believe in Deism? Such that God created the world out of nothing and then sat back and let the world carry on doing it's own thing, and he created the world such that it does not require his continuous creative effort in order to remain in existence?

In Catholicism, God is said to have no gender, strictly speaking. It is not correct to refer to God as "He" or "She", but we do this out of convention and tradition, because God is said to have both masculine and feminine aspects, but we have always emphasised the masculine. Is this the same in Judaism?

The more general question that I'm trying to ask is, what is the nature of God in Judaism? What are his attributes?