New and need ideas

Pretty much Im brand new when it comes to bikes, (first motorized thing i have bought) and ran into this site

I bought a XJ650 1982 recently and right now just trying to get it up to nice ridable standards, it run just fine (after cleaning the Carb got all 4 Cylinders to run) ill post any pictures i can (not in the best of shape) but I need a few ideas of what im expecting

Currently I need
Rear turn light (the yellow peice)
Horn button (still need to test if its the button or the wires)
Front breaks (im thinking EBC at a local store)
Rear Breaks (not entirely sure how it works or what i need, it tends to stick when pushing down the break pedal)
Air Filter (its just missing on the one I bought, the Carb is taking open air right now)
Muffler (it had some sort of stright pipe on it but its fallen off/rusted/broken not looking for anything special just a sound dampaner and need to know what would fit and hopefully cheap)
Carb Holders (they are quite dried out with many cracks air leaks through but not so bad)

If any of you have some good ideas of where to start it would help, ive seen a few sites selling the small stuff (air filters and turn lights) but i would like the advice foucing on the muffler, air filter, and the Carb holders.

 

Chacal, on this site, is the Master for parts for these awesome machines!

See his catalog on this site!

Also, I buy from Bike Bandit and Babbittsonline for accessories.

And, of course, ebay!

 

so after a little investagation apperntly im not missing my airfilter (i think) mostly missing the tubeing that goes between the carberators and a large black peice that i assume goes to the air filter