Actually I use Alpari UK terminal for chart porposes only - just to prepare research. In general, I prefer futures trading instead of spot forex, just because this is safer and has some advantages.
About lines... I suppose that you're talking about pivot points. Visit our Forex Military School corresponding chapter - to understand how calculate them.
I think Aise is talking about Fibonnaci retracements...
wich are also found in the Forex Military School. Aise...this school is a MUST READ if you are willing to manage risk based on technical analisys.