Alright first of all - don't completely disregard FL Studio. I realise you have just the demo but the full program is a little workhorse and can easily be compared to most of the other "big" programs out there. You'd just need to invest in a few soft synths but you would have to regardless.
If you're willing to spend some money on it you should purchase Vanguard by reFX, it is one of the most essential soft synths for house/trance/electronic dance music in general. Unfortunately it retails for some $350 USD so just use a torrent/warez website
Great little thing though.
Hardware isn't really necessary like the guy above me said but I have to put emphasis on how important soundcard/speakers are, especially monitor speakers. Of course you can make music without them, I used to use headphones for a long time surprisingly but I was quite used to them. Monitor speakers are one of the (if not) most important piece of equipment you will find when it comes to making any type of music. You will be able to notice things in songs that you never noticed before, truly a required item for any serious musician. Though they do retail for a fucking shitload so it's understandable if you can't get them right away/opt not to.
I don't make trance myself but I do delve into the genre and similar ones from time to time but you should also try to find a few sample packs - The Vengeance Essential House sample CDs have some of the best quality sounds I've heard, great range of sounds for drums and various other effects and percussion. Once again you could probably torrent it or something, not sure.