Reddit reviews Automating with STEP 7 in STL and SCL: SIMATIC S7-300/400 Programmable Controllers
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Wiley-VCH Verlag GmbH
It's similar to assembly language but I'm guessing that you have figured that much out already.
This might be helpful to you:
Automating with STEP 7 in STL and SCL: SIMATIC S7-300/400 Programmable Controllers
You should be able to download a trial of the TIA Portal (choose professional for the S7-300) It has a nice GUI that's more intuitive than the previous generation of software:
http://support.automation.siemens.com/WW/view/en/106448872?Datakey=47071380
Hans Berger books are the gold standard in instructional guides for automating in Step 7. However, if you have the help files installed, you should be able to find plenty of guides on your local PC.
http://www.amazon.com/Automating-STEP-STL-SCL-Programmable/dp/3895784125/ref=sr_1_1?ie=UTF8&qid=1421352480&sr=8-1&keywords=stl+siemens
As always, you can call Siemens and usually receive complementary in-person support for most basic requests: 1-800-333-7421