1) 7 days is really short to produce drinkable beer. My beer takes more like 3 weeks on average.
2) Don't ever add corn or cane sugar. That stuff doesn't belong in beer.
3) Why did you dump out the first batch? Sounds like it could have been OK...not infected anyway. Cloudy is no big deal. Guys who have been brewing forever chase clarity as a goal. It's a tough one. But hazy beer can taste awesome.
4) Everything is almost certainly OK.
5) With your new kit, start the ferment in the primary, let it sit in there one week. Then rack to the secondary fermenter and leave it there for 2 weeks or so (until ALL activity has stopped in the airlock and yeast has fallen out of suspension). Then bottle. Let it condition, and you'll have great beer.
Your first batch probably tasted bad because of the sugar. I have no idea why kits tell you to use that crap, because it frustrates people when their beer doesn't taste good. Then they lose interest.
Stick with it, mate. You can make great beer. My brother and I make all of the beer for our house and every party we have and most of our neighbors. We have three taps on the back porch. It's like a pub that doesn't charge. It's worth the effort
If you have any other specific questions or anything, I and others here are happy to help. Let's try and get your next batch done just right and I think your interest will be restored
