hello World!

Hi and welcome
first of all, there is a thread where you can post to present yourself.
second: use the search-function before you open a new thread.

To your "questions":
First of all you have to make up your mind if you want to produce your own music or if you want to dj. A Producer makes his own music at home in his bedroom/studio with help of software, synths, samplers etc. A DJ puts together sets of different tracks that others have produced and plays hour-long sets of "finished" tracks put together. the differences between djs and producers are slowly vanishing as most dj's produce their own music and play their tracks out. you will probably end up going down this route aswell but to begin, focus on either producing or djing.

Tips for Producing: there is no single best way to do it or a single go-to software. Pro-Tools, Logic, Reason and Ableton are just the ones that pop into my head when talking about the ones being also used by professionals. They all work with plugins (synths, effects etc.) or samplers to "produce" new sounds that can be arranged, expanded, edited etc by the software.
Check out some youtube videos, download some demo versions, play around, decide what you feel most comfortable with. at the moment Ableton is in many live performances of producers, definately have a closer look into that.
i am not an expert in this field, since i just recently started producing, this is just some personal experience and tips...

DJing:
easiest and cheapest to start with is probably digital djing. software-based djing with a program like traktor, serato or vdj with the help of midi-controllers.
easily expandable with cdjs (cd-players, used in most clubs these days, newer ones also work as midi-controller) and standalone mixers.
you can also always go with good old turntables and vinyl if you like it more responsive and analogue.

make your mind up and believe about what you want to do, do some research, watch some videos, talk to people (eg your friend who apparently promotes parties) and decide wich route you want to go. dont believe you can get all your questions answered right on, as producing musik and djing is a long process and has a learning curve. most questions will answer themselves if you are passionate and patient enough. dont believe you can get a sowftware today and be the next "(insert favorite producer here)" tomorrow. it takes time, passion and patience.

OK thank you erverybody for your quick answers, i recently saw the traktor s2 and i found it pretty sweet. Not so expensive.... A dj Controller (like the s2) is a "small" version of two cd turntables + a mix table, isn't it?

Thanks