If your engine cranks & does not fire up, your electrical supply is no doubt ok & leaves you to question your fuel supply. Considering that your engine was not used for a month(?), your fuel lines might be clogged ( fuel filter element might have disintegrated or hardened sediment is clogging your filter). Try to clean your fuel lines & change your fuel filter first. I presume your engine timing, TPS, & other sensors are within normal limits?