L'epicerie has most of the stuff. Agar, gums, and other things you may be able to find at a local asian place. Get a small, reliable scale that does at least 0.1g intervals, like a jewelers scale. No need to purchase a 5000g x 0.1g scale if you are using it for home use. The techniques and reactions can be cool and good to know, but don't focus too much on them, basics of cooking are more important.