I have SD pickup booster, tube distortion, EQ and amp simulator pedals. Is there a specific order the should be arranged in a chain to optimize effects?
Surely you've heard the bridge in Badge and were immediately struck by how it doesn't sound like a typical electric guitar?What he heck is a phaser and why would these guys think I need one for the bridge in Badge?
Regarding the usage of these pedals, I'd strongly recommend you build the signal chain, pedal by pedal.
Start with Guitar -> Booster -> Amp. Play with the Amp, then see what other colors you can achieve with the booster. Once you've got you tones from that combo, add in the distortion. Do the same thing with the guitar, amp and 2 pedals to really learn what tones you can create. Next add in the amp simulator. Finally experiment with the EQ, and how you can change the way each pedal sounds with the EQ. (Remember that a little EQ can go a long way, extreme settings will sound unnatural)
You may find the Booster or EQ make great boosts for leads. Or maybe they'll help you even out differences between guitars.
How did you go from 0 pedals to these specific pedals?
A Wah is a filter. It filters your "signal"
Like distortion, a lot of players like to filter a clean signal and then go from there.
You can how ever choose to distort your clean signal and then "wah" that.
Some very good advice here. The first comment is a good starting point but definitely try every possible combination to see if an unconventional placement is really your preference. Who knows, you might stumble upon something that turns pedals into an obsession. If your buddies have other pedals you don't own, don't be afraid to ask them if you can try them out and experiment. If you like it buy it, if not, move on.
If you're a player who likes medium to high gain tones, experiment with stacking different kinds of dirty sounds together. For example, your amps natural grit when cranked paired with your pickup booster or tube distortion box; clean amp, tube distortion and pickup booster. Maybe a fuzz pedal into a dirty amp or stacked with an overdrive. Certain pedals will balance each other out... A dark sounding pedal paired with a brighter one can result in massive tones ... Keep in mind with all this talk of stacking dirty sounds, I'm talking low to moderate gain settings. You can also use some pedals like overdrives to boost your amp or another dirt box so it distorts more by turning down the gain and cranking the level or volume knob of the boosting pedal above unity. If boosting another dirt pedal, make sure to put the booster before the other pedal. (I've been experimenting with this for a long time the possibilities are endless. Sometimes you'll find pedals virtually useless by themselves sound magical when stacked together

Nope. It is all preference. Mincer describes the logical/traditional order, it is also the way I would do it. However, move stuff around and experiment. Thinking outside of the box and innovating is the most fun and rewarding part of playing the instrument.