Answers
1. My former system was DTV, do I have to re-aim my dish?
First of , what type of dish do you have(model)?
depend on your dish, you may have to re-aim.
DTV use 101, 110,119.
ECHO use 110 and 119
2. What satellites are which services? DTV ECHO?
Not sure what you meant, but go to this website for info on sate channels
http://www.lyngsat.com/index.html
3. There are MANY setup options, is there a list somewhere to make sure each is properly configured?
I recommend you read the setup doc.
4. I had DTV, what kind of LNB do I have?
see answer 1