Navigate to source-sdk-2013\sp\src
Right click createallprojects.bat and choose edit. Select all the text and press delete. Copy the following code and paste it in:
devtools\bin\vpc.exe /hl2 /2013 /episodic +everything /mksln everything.sln
Same thing with creategameprojects.bat
devtools\bin\vpc.exe /hl2 /2013 /episodic +game /mksln games.sln
Open games.sln in visual studio 2013. It shouldn't ask if you want to update files but if it does say yes. Right click on the everything solution and go to properties.
Choose Configuration Properties then click Configuration Manager...
For the Active Solution configuration choose Release
Click Close, then OK.
Right click on the everything solution again but this time choose "Rebuild Solution". Wait for it to compile. If you did everything correctly you should get no errors. If you get an error debug it like you normally would, if you have never really coded before this means google the error and try and figure out why it broke on your own. Yes this might mean spending thirty minutes to an hour to figure out what broke. If you can't figure it out and you have put a good amount of time into trying to do it on your own post on the forums as well as other places like stack overflow.
Click File -> Open -> Project/Solution and find the everything.sln you created earlier.
Do the same thing as above.
NOTE: If you do not plan on modifying things like vbsp, vrad, vvis, shaders and the like you do not need to bother with everything.sln