I almost forgot, you should stock your field box with a few basic items. This includes a glow plug wrench, flat and phillips screwdrivers, metric and standard allen wrenches, a roll of clear packing tape, a small bottle of CA, some 5 minute epoxy, some extra fuel line, some extra wheel collars, spare props, etc. You never know when you'll need to make a minor repair at the field. Not being ready for that could mean a short flying day. Trust me, I've been there.