start off the start of strings

src/ch09-03-strings.md

@@ -3,16 +3,27 @@
 We've already talked about strings a bunch in chapter four, but let's take a
 more in-depth look at them now.
 
-## creating
+## Creating
 
+You can create an empty string with `new`:
 
+```rust
+let s = String::new();
+```
 
-new,  String::from and .to_string()
+Often, you have some initial data that you'd like to start the string off with.
+For that, there's the `.to_string()` method:
 
-## reading
+```rust
+let data = "initial contents";
+
+let s = data.to_string();
+```
+
+## Reading
 
 slicing syntax, indexing
 
-## updating
+## Updating
 
 push_str, concatenation