Hi Lady M,
Welcome to the brewing world. As much as it aches me to see your after a Miller Chill beer clone, here is some info.Truth is, its not and easy style to make and you have to start somewhere so I have attached a recipe below, its all grain so if your extract you will have to convert it.
I recently listened to a podcast from the brewing network and they had Annie Johsnon on air, she won the 2013 Amercian Home brewers award and the recipe is hers. AJ says at the bottom of the recipe that to get a miller style, to use flaked maize instead of the flaked rice.
AJ's Recipe
Mow the GD Lawn
Lite American Lager
A ProMash Recipe Report
BJCP Style and Style Guidelines
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01-A Light Lager, Lite American Lager
Min OG: 1.030 Max OG: 1.040
Min IBU: 8 Max IBU: 12
Min Clr: 2 Max Clr: 3 Color in SRM, Lovibond
Recipe Specifics
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Batch Size (Gal): 5.50 Wort Size (Gal): 5.50
Total Grain (Lbs): 7.50
Anticipated OG: 1.038 Plato: 9.49
Anticipated SRM: 2.4
Anticipated IBU: 9.0
Brewhouse Efficiency: 75 %
Wort Boil Time: 60 Minutes
Grain/Extract/Sugar
% Amount Name Origin Potential SRM
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26.7 2.00 lbs. Flaked Rice 1.040 1
73.3 5.50 lbs. Pale Malt(2-row) America 1.036 2
Potential represented as SG per pound per gallon.
Hops
Amount Name Form Alpha IBU Boil Time
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0.50 oz. Hallertauer Pellet 4.00 9.0 60 min.
Extras
Amount Name Type Time
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0.00 Oz Irish Moss Fining 15 Min.(boil)
Yeast
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Fermentis W 34/70
Water Profile
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Profile: Pilsen
Profile known for: Pale, Dry, Hoppy Lager
Calcium(Ca): 7.0 ppm
Magnesium(Mg): 3.0 ppm
Sodium(Na): 3.2 ppm
Sulfate(SO4): 5.8 ppm
Chloride(Cl): 5.0 ppm
biCarbonate(HCO3): 9.0 ppm
pH: 8.16
Mash Schedule
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Acid Rest Temp : 0 Time: 0
Protein Rest Temp : 122 Time: 15
Intermediate Rest Temp : 140 Time: 5
Saccharification Rest Temp : 145 Time: 120
Mash-out Rest Temp : 158 Time: 12
Sparge Temp : 170 Time: 30
Notes
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You want a fairly soft water so use Calcium Chloride.
If you shut the mash off at 140F it should rise to 145F naturally. You don't have to mash out beyond the 158F but feel free.
The key is making a true light beer, not a small beer. Feel free to use a different hop for bittering and flaked maize works, too.
Maize = Miller Lite
Rice = Coors Light