Hey Ron...First off...I think you'll enjoy build scale cars, if you like 1/1 cars. OK..to try and answer your questions...
Personally... I strip all the chrome(using concentrated laundry bleach...Clorox is what I use) from every build that I do. The Chrome that's applied to most of the the kits are way too brite for the smaller scales. I will leave the chrome for 1/12th and larger builds.
To re-chrome....I shoot a Black or Blue High gloss base coats. Alclad II has Chrome that has a little learning curve. You can use Alclad polished Aluminum as it works good too. I also use ALSA Mirror Chrome which has a small learning curve but does not rub off when dry.
If you want to leave the chrome and just touch up where it was cut from the sprue...then you can use a small paint brush( 3 0 or smaller) and a dab of Model Master Chrome Silver #FS 17178. Model Master has another chrome paint but it's not as good. I've used both and this one works the best between the two. Put a small amount of paint in a mixing pallet and add a drop or two of Lacquer thinner. Don't mix it in just let the thinner hit the edges of the paint and then load you brush and apply to the spot on the part.
NOW...since MOLOTOW has come out with 3 paint pens and a refill bottle...all one has to do is just touch the part with it and it's rechromed. But...the small down side of it is..it takes at least 3-4 days for it to dry. It's is remarkable how well this paint looks when applied. If you can work with the dry time...then Molotow is the way to go. You can do a search on the web and watch a a few videos that's out there on it.
Well Ron...I hope I've shed a little light on the chrome thing for you. Just remember there's no right or wrong..it's what ever works best for you.