Put the egg in your party with some energetic Pokemon and walk around until it hatches. If you haven't got any perhaps you have a Pokemon with the ability flame body, e.g. slugma. Put the slugma (or other Pokemon with flame body) at the front of your party ,and the egg second, and walk around for a while until your egg hatches. The ''hot tub'' in lavaridge town also considerably speeds up the egg hatching process.
Eggs usually hatch on their own anyway, you just need to do a bit of walking around first. Maybe try walking back to your home town of Littleroot? That's quite a lengthy journey, either way; just walk around until your egg hatches.
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Walk alot like 3500 steps
you will have to resurrect it in the laboratory in cinnabar island.
The best legendary fire type is ho-oh. The best non-legendary fire type Pokemon is charizard.
lots, and lots of walking/running/biking. for tips check out serebii.net, the pokedex there has the number of steps listed in the description for each Pokemon. also there are ways to decrease the amount of steps required, such as having a chancey or having a fire Pokemon with the ability flame body or magma armor.
Fire Extinguisher