You can do all that and midi is not sound nor music, its data, and if your not confortable with FL like many others, try cubase, ableton live, protools, etc.....
A DAW or Digital Audio work station IS a sequecer or there called sequencers, and obcourse drum sequencer like the ones on drums machines like 909s and 808s and FL studios drum/sample sequencer.
Sample librarys VSTi's and stuff like that are around, here let some one eles answer this for you because im running out of time here, and welcome to OCremix.
somewhat of a communtiy:tomatoface: (j/k)