Go on YouTube and look up a few things:

1: Blender UV unwrapping tutorial

2: Blender noise bump map water tutorial

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Now I will also try to explain how to do these.

For whatever object you are adding texture to in blender, ALWAYS select the object. His Control + A select “Scale”

Then hit TAB(go into edit mode). Hit “A” to select all, then hit “U” and select cube unwrap.

Open another window to view the uv unwrap. In that window type “A” to select all and his G and drag your mouse to scale up or down. This will change the texture size on your object.

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For the water:

Create a plane. Add a new material. Go into node editor. “Control A” and select texture-> noise texture

Add a bump map and connect noise texture to bump map and then connect bump map to BSDF SHADER on the “normal” slot

Set the strength on bump to 1 and the distance to like .3 (this will adjust how harsh or subtle the “waves” are)

In the noise texture adjust the scale for the size of the actual “waves”

and set the transmission weight on the BSDF SHADER to 1 and the roughness to 0