Hi Stumanipi
First off, apologies that you felt you were being abused. I am sure there are many here who have no such intention.
To your original post (or, what is left of it), I am not a professional; certainly not a wedding tog. I will try a common sense approach to the problem.
First : what is your friends expectation from the photographs? If its professional, or even, very high quality, he would need to pay good money to get that. Chances are, you will not be able to produce it ( but then again, you may. Just because you dont know anything about Digicam doen not mean you dont know photography. After all, very high quality wedding photographs existed even before anyone dreamt of digital and photoshop). Besides, not everyone cares about wedding photography; many would be happy with 'snapshot type' photos as a record and memory of the day. If your friend is that kind, you have a good chance.
You havent used DSLR; but I am assuming you have film SLR. If not, you have a steep learning curve. Depending on how far away the wedding is; and how much you are willing to learn, you can still pull it off.
The next thing is the budget. Depending on how much you know of wielding a camera, how much you are willing to try, and what your budget is - you can choose a camera - and not necessarily DSLR.
Obviously on DSLR your choices are : entry level DSLR or the more advanced ones. And buying new or preowned.
Obviously the cheapest solution is a pre-owned ( 2-3 years old) entry level DSLR with a kit lens ( 18-55 or 18-70 or thereabouts). Something like Nikon D50 + kit lens. From there on; as a general rule, like everything else, the more money you pay, the better kit you get. Nikon and Canon are the most popular DSLR, so your choice could very well lie there.
You could also think of a bridge camera - the ones which are in-between SLR and simple P&S.
You will find a separate flash useful. Jessops own brands are cheap; and pre-owned ones cheaper.
Finally , post processing. Using post processing softwares; you can improve the photographs. Again, you can learn it; or may be your friends can learn and improve their wedding photographs over time.
Sorry if you already knew what I have said. In that case; if you would frame the questions better - but without any reference to 'intent to buy' may be some of us could pitch in again.