I am a girl who has been djing for about 8 yrs now
first bit of advice, enjoy yourself while learning.
It might get to you at first when you can't do it properly, just enjoy the music your playing and stick with it.
There are lots of things to learn when starting out, I have taught a few friends myself i usually start with
1. Beat mixing- this is the basic skill and i'm sure they will teach you this first on the course, get your cue-ing up technique perfected first ( when you start the record off ). Get into the habit of counting beats, 4 by 4 is your regular house beat and is easiest to learn. Depending on how much you practice depends on how quick you can do it and perfect it until you can get to the stage of mixing, watching tv and having a conversation at the same time ( eventually after a long time it all happens in the subconsious )
2. Finding musical patterns and bass lines - You will find certain musical patterns and basslines go well with some songs than others and matching the right ones you will give you a better mix,
3. Tricks - using the crossfader and volume sliders to add a little extra to the mix, you should start to learn this sort of thing after you perfect beat mixing as otherwise it will only complicate things.
4. EQ - using the bass mid and treble while mixing can even out the mix so it is more smooth and sounds better. Also u can try blowing your speakers up by turning the treble up to the max while playing higher state of consiousness.
5. Playing to people - Once you have learned all that or even some of that, the hardest thing is playing out. Judging the atmosphere and creating the correct vibe for the night is THE most important thing in DJing. From playing the right records to putting them in the right order . If you know a club well then it makes it easier because you know the style of things. If i'm playing somewhere i don't know then I have a look and see what sort of people and music are there.
Getting work is difficult when you are starting out, get to know the right people, its not what u know, its who you know. Start somewhere small and if people like you then your on your way.
Most important thing is to buy plenty of records and enjoy yourself, I have loved Djing whether i have been on my own with friends or in a club.