A few tips, maybe?
Find a DAW that you like. (Again, I'd recommend PreSonus Studio One if it weren't for the price, but I've heard that Cockos REAPER has a fully functional free trial that only becomes nagware when it runs out.) Definitely get something with VST and MIDI support.
Unless you're going to be hiring players or learning the instruments yourself, build a library of those aforementioned VST instruments and effects—stuff like drums, synths, pianos, reverbs, limiters, et cetera. There are a lot of decent free ones out there. Be mindful of disk space, though.
If you're going to be doing MIDI sequencing (essentially digital sheet music) invest in a MIDI keyboard. Makes writing infinitely easier.