There is information that can help you over there-------------->
Check out the Getting Started Tutorials and System Requirements. There is also information in the FAQs section as well.
As to your first concern, all you may need to do is make some adjustments to your system to optimize play. Some have suggested shutting down 'Options' that you don't need...that seems to have helped me play a smoother game. As to the red line, if you are reffering to the target line, it will be blue when you are within the distance of the selected club and the line turns red when you move the aim point outside that distance. This is not to say the red line will not get you to the target, you'll still need to make adjustments like for wind and elevation, so a red line could be OK. Again, check out tutorials for more info on both these subjects.
Joey
Edit: Sorry Niv, I was composing and did not see your post.