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This machine is for giving sewing projects a strong and professional edge, and has multiple ways of finishing the seam. It's a complex piece of equipment, and as such, it requires an induction. The manual, unlike that of the sewing machines, is less 'suggested reading' and more of a requirement to use the machine correctly and get the best results.
While this machine is relatively robust, we advise against working on it with seriously heavy materials - you're likely to break the needles at minimum, and be forced to re-thread the machine, which is a non-trivial task. Forcing through overly heavy fabric can break the machine entirely too, as can too many layers of fabric. While it may not give as good a finish, we suggest the use of our Singer 4423 Heavy Duty Sewing machine instead.
File:SingerOverlocker14SH754InstructionsENGLISH.pdf Smaller, English only manual
The basic anatomy of our machine - http://www.makery.uk/2015/05/serger-series-part-1-anatomy/
How to thread the machine (clearer than the manual) - http://www.makery.uk/2015/06/serger-series-part-2-threading/
Setting up the tension - http://www.makery.uk/2015/06/serger-series-part-3-nailing-tension/
Transfer thread from large cones to small spools (for when you don't need miles of thread) - http://www.makery.uk/2016/01/top-tip-transfer-thread-from-large-cones-to-small-spools/
A long term review that also gives some handy tips - http://www.kestrelmakes.com/2013/11/the-singer-14sh754-overlocker-from-lidl.html