I was QM for our last course (in 2014). Now I'm rooming with the QM for our current course so we have compared notes about my style versus his and so on. Here are some things we agreed were very useful:
1) Eagledad hit a couple of the big points - if you are not super organized, find someone who is and get them to be your assistant. You should be the first to arrive and the last to leave.
2) Know your stuff - that is, know what materials you need for every minute of each day. Also know what materials you have available to you.
2a) Have a starting inventory - what stuff was in your totes when you started. Create an ending inventory. This is partly to know that you have everything you need and partly to track what is consumed/lost/broken and needs to be replaced for next time.
2b) Organize your stuff into totes or boxes according to what makes sense to you. Mine were actually organized by category of items (flags in one tote, candles in another etc) but this course QM reorganized by day.
3) I created a "QM staging book" - I took our detailed daily schedule and added a column for "what items does the QM need to provide" for every session of every day. It was very detailed and included things like what order are the items arranged on the table (i.e. for the WB Traditions ceremony)
4) I created a staging area - there is a set of tables (behind the scenes) that I set out everything needed for each day. The staff all knows that is where they pick up items and that is where they return items. Last thing I did before going to bed each day is pack up today and lay out tomorrow. My staging book is on the table.
5) Be pleasant but be clear from the beginning "stay out the the QM totes". I know what is there and where it is. I can get it for you faster than you can find it yourself. I am responsible for making sure you get what you need and I cannot do that if somebody has moved things or taking things out without me knowing it. This is absolutely critical for day 1 - there are so many moving parts on day 1 that if something is not where it should be you can have a stumble that the participants see.
6) Have things on-hand for staff development meetings. Our QM this time around did not always have the games and props on hand for Troop Guides to practice during staff dev meetings. That left practicing until the setup day just before the course. As ASM TGs I was not thrilled about that.
7) The QM is responsible for food. I was fortunate that a) we planned staff development for half days and I only had to provide snacks, not meals. And b) during weekend 1 we had recruited very experienced kitchen help and I was able to delegate the entire food process to him. This time around our Assistant QM managed all of the menu planning and food purchasing. It was a ton of extra work for her. If you can off-load everything food related I strongly suggest that
7a) The coffee pot should always be on!
8) Vendors - plan way ahead and be meticulous with vendors. We worked with one vendor for trinkets, another for apparel, a third for the course cap/tshirt and a fourth for the woggle cord. The cap/tshirt vendor is someone I had worked with for several years and was wonderful (that is why I keep working with them). The apparel vendor and woggle cord vendor were also very good - both had SNAFUs with shipping that caused items to be delayed. Both immediately shipped out replacements without worrying about right/wrong/payments etc. The trinket vendor was difficult to work with. The consignment items were not received when I had requested them to arrive, the contents of the package did not match the packing list they provided, a few items were broken in transit and they accepted no responsibility for discrepancies. Unfortunately we were not able to find another vendor to offer trinkets so we went back to them this year.
Finally - consider what your real job is. You may come to a different conclusion, but I considered my real job as making sure the staff (especially the Troop Guides) had what they need, when they need it, where they need it. I wanted items (including food) to magically appear exactly when they were needed and disappear when they were done. This was my vision for success, it guided my organization and planning.
Good Luck and enjoy watching the machine move know the part you played