Air Mail RCU has a good tip about extra glow plugs.. If you have a decent local hobby shop in your area, they will have these inexpensive goodies.......
The OS 40LA uses an A3 glow plug. These cost around $3 apiece. When you get your plane, take the prop nut to the hobby store too. Those 4-way wrenches they sell should fit the nut and also the glow plug.
Another handy convenience ($10-$15) is a fueling setup to fuel up directly from the jug. Dubro or Great Planes has a setup by drilling a couple of holes into the jug cap and installing fittings, you pump directly from the jug into the tank. By reverse cranking your hand fuel pump you can also pump unused fuel from the tank back into the jug (closed loop arrangement). No necessity to catch overflow in an extra container when fueling the tank.