So for example, if the text file reads:

http://website1.com
http://website2.com
http://website3.com

I can hopefully output them to variables in the batch. Example:

set var1="Line one of text file, ex: http://website1.com"
set var2="Line two of text file, ex :http://website2.com"
set var3="Line three of text file, ex: http://website3.com"

The FOR /F loop command can be used to read lines from a text file:

@echo off
setlocal ENABLEDELAYEDEXPANSION
set vidx=0
for /F "tokens=*" %%A in (sites.txt) do (
    SET /A vidx=!vidx! + 1
    set var!vidx!=%%A
)
set var

You end up with:

var1=http://website1.com
var2=http://website2.com
var3=http://website3.com

Here ya go! Have fun with this one.

(
set /p var1=
set /p var2=
set /p var3=
)<Filename.txt