SED not adding a first line to .csv file - bash

Question

I am doing a project for school and my head has gone through 3 walls with how many times I have bashed it. the project is to ask a name and color and assign each to a variable then make a directory from the color variable in the /tmp directory. create a .csv file with header, pull the information from a given .txt file out of order and add only select columns. I have gotten to the point of adding the columns but no matter what i do I cant get sed to add a header or import the information from the .txt file.
as you can see i have tried multiple ways to modify the file but I dont know enough yet to make it work
the input file format is as follows
1. 734-44-2041 James SMITH jsmith#beltec.us 360-555-4778 360-555-0158
and it should look like
james,smith,james.smith#beltec.us,734-44-2041-000
I am assuming that the 3 commas are intended to be 0's at the end
this is the code I have so far
#!/bin/bash
#interactive=
#variables
color=/tmp/$color
csvfile=/tmp/blue/midterm.csv
if [ "$1" == "" ]; then
echo "you should use the -c or -C flags
exit
fi
#adding the -c flag and setting the filename variable
while [ "$1" != "" ]; do
case $1 in
-c | -C ) shift
filename=$1
;;
* ) echo "you should use the -c flag"
exit 1
esac
shift
done
#get user's name
echo "what is your name"
read user_name
#get fav color from user
echo "what is your favorate color"
read color
#make the fov color directory
if [ ! -f /tmp/$color ]; then
mkdir /tmp/$color
else
echo "bad luck $user_name"
exit 1
fi
#cd into the directory
cd /tmp/$color
#make a csv file in /temp/$color
touch midterm.csv
akw '
BEGIN { FS=OFS=","; print "Firstname","lastname","Maildomain","Password" }
{ print $2,$3,$4,$1 }
' "$filename" > "/tmp/$color/midterm.csv"

Answer 1

sed by default outputs its results on the standard output.
In case you need to overwrite the old file use -i (or better -i.bak) to keep previous file version in <filename>.bak
Moreover in case you need to add something only at the beginning of the file use following syntax:
sed '1iYOUR_TEXT'

Answer 2

You never need sed when you're using awk. All you need to create a header + content is:
awk '
BEGIN { FS=OFS=","; print "Firstname", "Lastname", "Maildomain", "Password" }
{ print $3, $4, $5, $2 }
' "$filename" > "/tmp/$color/midterm.csv"
Or if your input file isn't a CSV as it seems not to be by your updated question:
awk '
BEGIN { OFS=","; print "Firstname", "Lastname", "Maildomain", "Password" }
{ print $3, $4, $5, $2 }
' "$filename" > "/tmp/$color/midterm.csv"