How do I fit a holographic sight on my carbine?

[Wouter]

I recently purchased a BXP 9mm carbine and I'm interested in fitting a holographic sight for night shooting and as a patrol carbine. Here is a picture of where the sight will be fitted: http://twitter.yfrog.com/odugsknj

I have the following questions:

1.Will I have to buy a weaver mount seperately or can I screw the sights directly on to the gun?

2.For what distance should I zero the sights?

3.If I zero the sights as a left-handed shooter, will a right-handed shooter be able to shoot with the same accuracy?

4.The option of sights is limited by price - I would love EoTech, however my finances are limited and saving up for ten months isn't an option. The NcStar and the knock-off Eotechs are available. What sight available to South Africa could be considered durable enough for my purposes?