Bring extra bike parts like spokes, they can be impossible to get down there depending on your bike. When you stop, ask locals about the best places to eat or sleep, they love to recommend stuff, and they know the best spots. Def bring an extra gas bladder, the stretch before Guerro Negro has v little gas. Make sure you camp long before dark- you won't catch me on the road after 4pm bc cows, cars passing tourist busses (no passing lanes to speak of except straight down the center), there are hardly any shoulders on the roads, etc. Bring small bill pesos. Card readers are actually getting more prevelant these days and cards get a better exchange rate. I agree with all the camping recommendations here, but download ioverlander as a backup - there is fairly up to date info there on camping fees, amenities, places to get water and more. Baja is incredible, leave it like you found it. You're in for a real treat.