Pedal Order 101

Without effects loop:
With effects loop:

Guitar > Tuner > Wah/Filter > Fuzz > Octave/Pitch > Compression > Boost/OD > Preamp/EQDistortion > BufferAmp
Effects Loop Send 
> Phaser/Flanger
> Chorus/Vibrato > Tremolo > Delay/Reverb > Return

This is only a guide to get you started. Best advice, EXPERIMENT and PERSONALIZE until you find the sound you are looking for.