mediabase - how to organise

OK, so chrome started working and I can post in other boards. Still don't know what the problem is with firefox, but anyway.
I saw someone mention a 'smaller mediabase' to enable easier searching through tracks. I play all sorts of stuff, sometimes within a genre but often mixing multi-genre, but a mediabase with gb of tracks in can be a pain to search through.
I know playlists are one option but that seems to me more useful for specific sets, and I like to improvise.
Is there a way I can just load one or two genres of music, or maybe just a range of bpms, rather than having to have my whole music collection displayed?
What would be the easiest way to set the mediabase(s) up?
So far I've just scanned the music folder each time I've added tracks but this is getting out of hand, it takes ages to look through loads of stuff I don't want at that time.
I'm new to this software so feel a bit like I'm groping in the dark...
I saw someone mention a 'smaller mediabase' to enable easier searching through tracks. I play all sorts of stuff, sometimes within a genre but often mixing multi-genre, but a mediabase with gb of tracks in can be a pain to search through.
I know playlists are one option but that seems to me more useful for specific sets, and I like to improvise.
Is there a way I can just load one or two genres of music, or maybe just a range of bpms, rather than having to have my whole music collection displayed?
What would be the easiest way to set the mediabase(s) up?
So far I've just scanned the music folder each time I've added tracks but this is getting out of hand, it takes ages to look through loads of stuff I don't want at that time.
I'm new to this software so feel a bit like I'm groping in the dark...