First off get some good ortho images if you can and import into the scene. Adjust them in PS if you can, though this can also be done in Maya. There is a section in here somewhere about the import of ref planes.
Use as little polys as you can to get the basic shape...DONT try to model with a gazillion polys, this will just make life very hard for you. Concentrate on the 'main' shapes before trying to add detail.
Get as many images of the model off of the net as you can, say if its a car, get LOTS of pics of the car you are making. As many as you can, the more the merrier, you can never have enough ref images.
IF you are a beginner I would suggest a tutorial from here, the one I first did was Kurts Spitfire, one I havent finished due to work constraints was Jays Ramsay and Surfing with the Alien. They are all excellent tuts and offer both organic, hard surface, UV mapping and texturing in nice easy to understand packages.
Good luck with it...and also visit the Maya FAQ here in the forum...helps a lot.
Cheers bullet
bullet1968
"A Darkness at Sethanon", a book I aspire to model some of the charcters and scenes