What size service do I install in my home?...

  Most states call for 100 amps minimum, but with all the new electronic devices, air conditioning and electric heat, I would suggest 200 amps especially in new homes. This also gives you some space for future additions. This is not a job for an unlicensed person to attempt. In most cases it involves replacing everything from the service loop (this is the wire that extends from the top of your meter to the utility tie in ) up to and including the main panel.
Depending on the layout of the house and the area upgrading to a 200 amp service could cost anywhere between 800 to 1,500 dollars.
Rewiring an entire house, again depending on the layout of the home could cost between 2,000 and 4,000 dollars. These are just rough estimates.

How many convenience outlets in each room?...

 
 In every kitchen, family room, dining room, living room, parlor, library, den, bedroom, or similar room or area of dwelling units, receptacle outlets shall be installed so that no point along the floor line in any wall space there is more than six feet, from an outlet in that space. This is to prevent the use of extension cords. Outlets are usually placed about 18 inches above floor level. Switches usually go about 48 inches from floor level. For convenience outlets each single receptacle in a single branch circuit is usually figured for 1.5 amps, duplex outlets for 3 amps in estimating total amperage for that circuit. Air conditioners should be on a single dedicated circuit.

When is it time to call an electrician?...

   When you are resetting circuit breakers or changing fuses to often. When you turn on your air conditioner and the lights dim in the room. When your lights flicker or go on and off. When you can smell electricity burning. When you have six electronic devises going into one outlet in back of your electronics center. When you have receptacle outlets overburdened by multi-plug strips. When a three-prong plug needs a two-prong adapter. If you have to run extention cords to plug in electrical devises

Can you use a G.F.I. in an ungrounded outlet?...

 The N.E.C. allows a G.F.C.I. to be used in an outlet with a two wire ungrounded cable, but this might not be that great an idea for several reasons.
 First: The ground lug on a G.F.C.I. receptacle might give the false impression that the outlet has a grounding wire.
 Second: The surge surpressors used for computers and other electronic equipment require a properly installed grounding wire to work correctly.
 There are several other ways to ground outlets. Here is a couple of them. First...Find out if the metal box that holds the receptacles has a proper ground, if it does you can either run a pigtail from the threaded screw in the box to the ground on your receptacle, or install a self grounded type receptacle. Second...And possibly the best and safest way is to run grounded cable back to your panel for each branch circuit. Whichever way you decide to go, these outlets should be grounded for your own safety.