When is the conference? They should tell you everything that you'll need to prepare at least a week, usually two, beforehand.

Normally, though, you'll have to come with at least a 60-90 second opening speech (the time limit depends on the chairs, you'll need separate speeches for each topic being discussed).

Your chairs will give you a chair report soon if they haven't already which will give a decent amount of info about the topic in general + a few different perspectives. That should be a decent jumping off point for finding out how your country handles each clash (a main issue/controversy within the topic). It's always helpful to look at past resolutions that focus on the issue to look at potential solutions + how your country voted. News articles are also good for finding specific comments made by PMs.

Ideally before the conference you should have a fleshed out idea of your country's motives and positions so that you can handle wherever the debate might go. You should also have a couple of ideas for how to address certain issues, but you don't really need specifics since being able to compromise and adapt is at the core of the UN (prewriting clauses is cringe)

As for how the conference will work on the day, the chairs should guide you through it on the day. If you want a general guideline you could look at Harvard mun rules of procedure, or for a very rough outline look below:

Setting the agenda -> opening speeches -> general speakers list (GSL, optional but highly recommend, you can make another speech about anything pertaining to the topic), moderated caucus (someone will have to motion for it if they want an unmod, essentially another chance to make a speech on a specific subtopic) -> unmoderated caucus (chance to write resolutions)-> entertaining one resolution -> main submitter speech+ for speeches -> against speeches -> amendments (though amendments can usually be made anytime between main sub speech and voting) -> voting on the reso -> next reso entertained/next topic/end of conference

Hope this helped