Flutter: How to make such Edit text and remove the unexpected layout padding - flutter

Question

I'm trying to implement this design:
i'm very beginner to flutter, and what i'm getting is this:
I don't want you guys to get me wrong, i'm not asking for someone to implement this for me.
i need guidance on how to:
remove the layout padding.
make a textview and edit text side by side look like one widget.
remove the space between the edit texts.
implement the CheckBox (i tried a row with check box and text, didn't work)
show a proper arrow in "Sign In" (instead of ->).
just some explanations, guidance and any documentation or tutorial that could be good for my case.
Here is my code

Answer 1

remove the layout padding.
make a textview and edit text side by side look like one widget.
Im not sure of this if your talking about inside TextFormField you can use contentPadding inside InputDecoration. But based on your layout design, you can separate the Label in TextFormField and create your own label text
Row(
children:[
Text("LABEL"),
Expanded(
child: TextFormField(),
)
]
)
4.implement the CheckBox (i tried a row with check box and text, didn't work)
Row(
children: [
Checkbox(
value: isValue,
onChanged: (bool value) {
setState(() {
isValue = value;
});
}),
Text("SOME TEXT"), //Read RichText widget for your design
],
),
For you arrow -> sign in
Try using Icon() widget