@darthbii Phrase matching requires knowing your music as the basis. Just listen to a song and think about/remember how the song progresses by counting beats.

edit: To answer you question quickly, DJs find out mix points in music by experimentation and practice. You'd be surprised how often you find fun mixes just screwing around with a deck and some tunes. Try taking 2-3 songs (or 5) and just mixing them in and out over and over again at different points using different techniques.

I count my beats in 8s, other people do it with 4s. However you count it, a phrase consists of many beats in a phrase (8, 16, 32, 64, and so on). Phrases can be very different across genres.

Using Martin Garrix's "Animals" as an example, listen to the first part of the song (where the kick drum and hi-hat is playing).

1. Count from the first kick drum (1,2,3,4,5,6,7,8. 2,2,3,4,5,6,7,8. 3,2,3,4,5,6,7,8. 4,2,3,4,5,6,7,8).
2. When you reach 8,2,3,4,5,6,7,8 you will HEAR that the music is changing, something is being added to the mix (in the song it's the bigger bass drum)

Now, you counted 8,2,3,4,5,6,7,8 and SOMETHING GETS ADDED, right? So in this case the Animals 1st phrase is made of 64 beats. If you wanted to mix something in, you would try to MATCH song B's phrase to song A's phrase.

This means that when you press play on Song B, your count must follow Song A's count. When you are counting for Song A, Song B is doing the same thing. How you mix between A and B is up to you, there are many different techniques. However, what you want is to fader up Song B and fader down Song A by the time you hit song B's new count. Example below

Song A 7,2,3,4,5,6,7,8 (fader half) 8,2,3,4,5,6,7,8 (fader down from outro)
Song B 7,2,3,4,5,6,7,8 (fader half) 8,2,3,4,5,6,7,8 (fader up INTO breakdown/intro)

This is a very simplistic diagram to try and explain to you phrase matching. Like I said before, dubstep is alot different in how they mix and match songs. I again recommend you try learning using normal songs to try first.

For most dance music songs it is a 4 by 8 (not sure if I put it right) 4 bars of 8 beats before something new comes in.

Like hanleon said, try counting 4 bars of 8 beats and you'll notice something new comes in, e.g. hats or the snare.

Pre-cueing your songs before a set can really help in the smoothness of your mixing because you know how long you have to mix and exactly what will happen after the 32/64 counts. Some djs even mark their mixing point so they dont miss it during a set.

But end of the day is about practice and getting to know your songs. Try putting a couple of songs together and practice and you will be able to notice certain "spots" that just shout "MIX ME HERE" 

*or maybe thats just me* 

Save it. Get a DAW to play with either a demo version or pay for one.

Notable DAWs available:
Ableton/FL studio/Reason/Cubase/Sonar x3 and etc.

If u just wanna test,learn,play and produce something simple there's a free simple DAW software (legal) here.

CAUSTIC 3

depends are you a hardworking or kinda need the motivation spoon feeding type of person.

Good thing about courses (if good teacher) is you can skip the process of bumping into unnecessary mistakes and picking up bad habits (happens with all instruments). They could probably give you good samples and examples of sounds and guide you on the right track if you make a mistake.

However, if you're like me (I'm pretty impatient and I dont like committing to a fixed schedule, so yeah I never really had luck in theoretical or music lessons.) then you might just end out wasting 1.5k without actually learning anything.

There's tons of lessons available online. Perhaps you could try those first?

But if you follow a schoold they might be able to hook you up with some good labels or such or teach you the ins and outs of marketing and copywriting etc. Not sure if they cover that.

Let us know how it goes if you enroll