automation scripts--help needed urgent

[whizkidash]

Hi team,

Well i have been asked to make use of automation scripts for my host production box.. .And i hope u will help me with the same.

#script as below:
a)when i run script it should ask the person to key in..(means should be interactive)
b) it should search a file
c) it should replace a word/ multiple word in a file and prompt user for more changes once he done with
and finally..
D) delete the line rows... (any rows- mentioned by the user on files)

I am done with the 1st script but i am having probs with the second and third

2)I knw sed will replace

sed 's/(word)/(with-word)'/ file name

3)and sed 'line,lined' file

but how to use in the below script and ask the user for more inputs..
Please provide me with the earliest..
thankin you once again

PS: Moderator pls dont treat this mail as repetative

regards
whizkidash

vi showme.sh(script name)

echo "type the file to be search"
 read fname
if ls -lart | $fname
then 
echo " File exist"
else echo " File fail"
------(uptil here it run fine)
echo " type the file to be replace/or substituted"
read tname