I would get rid of the corn sugar all together and buy some hops. Pre-hopped extract tends to not be to good with bitterness. Since this is your first brew I would do an ale as well. So here is a proposed shopping list if you have a LHBS or if you want to wait for a shipment.
1 can munton's amber liquid extract already hopped (3.3 pounds)
2 pounds plain light malt extract powder
Double this to 4#s
1/8# Chocolate Malt
1/2# Crystal 20L
Buy precrushed and place together in muslim bag
Bring 1 Qt water to near boil shut off flame
and place muslim bag with grain in water and steep
for 30 min
3/4 oz of Perle (7.7%AA)
add to begining boil (60min addition)
3/4 oz Williamete (4.5%AA)
add at 15min left in boil
1 teaspoon gypsum
1 teaspoon irish moss
1 packet of lager yeast
Replace this with 1 pkt dry yeast (SfAle 05)
5.5 gallons of water (boil volume 3.5 gallons) Top off to 5.5 gallons.
Or just use what you have and brew. DWHAHB! Welcome to the club.