More wisdom from the Belgic Confession (1619), about how we can know who God is (Article 2):
We know him by two means: first, by the creation, preservation, and government of the universe; which is before our eyes as a most elegant book, wherein all creatures, great and small, are as so many characters leading us to contemplate the invisible things of God, namely, his eternal power and Godhead, as the Apostle Paul saith (Rom. 1:20). All which things are sufficient to convince men, and leave them without excuse.
Secondly, he makes himself more clearly and fully known to us by his holy and divine Word; that is to say, as far as is necessary for us to know in this life, to his glory and our salvation.
Somebody created the universe. Somebody preserves the universe to keep it intact. Somebody also governs it, by establishing and upholding it day by day. I particularly like the description of the creation as “a most elegant book.” We can look at creation, and tell something of our Maker and Sustainer.
To be sure, this world isn’t the way Yahweh originally made it. But, even though marred and ruined by the Fall, it still reveals His glory, goodness, grace and kindness each and every day. This is enough to “convince men, and leave them without excuse” that He exists, and it tells us something about His “eternal power and Godhead.” This general knowledge doesn’t tell us how to know God, who He really is, or what has gone so wrong with our world (and with us). It doesn’t even tell us His name! But, it does tell us He is there, He is powerful, and He is Almighty.
From there, God “makes himself more clearly and fully known to us by his holy and divine Word,” which another confession of faith calls “a perfect treasure of heavenly instruction,” (1833 New Hampshire Confession of Faith, Article 1). The Bible doesn’t tell us everything there is to know about Him. But, it does tell us everything “as far as is necessary for us to know in this life, to his glory and our salvation.”
So, if you want to know God – look at the world around you, see the evidence of His presence in creation, and His goodness and grace in sustaining that creation. Then, look to His Holy Word, and read about who He is, and what He sent His eternal Son to do so long ago.
Start with one of the Gospel accounts, like Mark.