Genesis 1:22

"God blessed them and said, 'Be fruitful and increase in number and fill the water in the seas, and let the birds increase on the earth.'"  Genesis 1:22

In the Interlinear Bible "increase in number" can be translated "become many or great," but it does still seem to be encouraging the water creatures to multiply and fill the waters.  So whatever creatures are in the waters and whatever birds or flying creatures that God just created, he's now telling them to go thrive through out the earth.  And they did.  It's not hard to find birds or water creatures.

Genesis 1:21

"God created the great creatures of the sea and every living thing with which the water teems and that moves about in it, according to their kinds, and every winged bird according to its kind. And God saw that it was good."  Genesis 1:21

So again God has created exactly what he said he was going to create.  Now all the waters and skies are filled with the creatures that swim and fly, and God sees that it is good.  There's no way of knowing how many of each kind God created, but it was enough that they could multiply and thrive.  I don't know if any of these are dinosaurs, but I tend to believe there were.  Like the great creatures of the sea, I think included not just whales, but dinosaurs also.  But no where does it ever give an exhaustive list of the animals God created in the Bible.

Genesis 1:20

"And God said, 'Let the water teem with living creatures, and let birds fly above the earth across the vault of the sky.'"  Genesis 1:20

In the Interlinear Bible it translates creatures as "living beings" and birds as "flying creatures."  So here God says to let the waters be full of living beings and flying beings fly in the expanse over the land.  So every creature that flies or swims is what he is about to create.  He's already created the vegetation, so these creatures will already have food and shelter provided for them.  And they'll already have night and day and the stars and the sun and moon.

At Pbcc.org they have the creation week divided into 2 sets.  The first being the forming of creation and the 2nd being the filling of creation.  The filling of creation actually started with Day 3 with God creating the sun, moon, and stars for the light he created on the very 1st day.  So the 4th day is filling the sky and seas that God created on the 2nd day.  An interesting thought, that 1st God creates a place for the creature and then he creates the creature.  He's doing the same for us now.  He's creating a home for us in heaven, before he comes again to turn us into a new creature.  (Not that I would really call the sun, moon, or stars creatures, but there is a lot we don't know about them, so maybe they could be...)

Genesis 1:19

"And there was evening, and there was morning—the fourth day."  Genesis 1:19

Just like verse 13, this is just stating the completion of the 4th day ever.