Lawn problems in Edmonton Alberta

Hello,
I am a senior living in Edmonton in a modular home park. I rent the lot. When I moved in last year I did not have the time to address the lawn. This year I want to make it my priority. Approximately 1/3 of the grass is clover and I have been told that applying Killex properly will address that. My larger problem is the dandelions. They cover most of the lawn. I started digging them out. A person would need a tourist visa because some of the roots I am sure go to China. Actually, they are approximately 1 foot deep. There are many many dandelions. I hired a young boy to help, but the job is too big. I have purchased Roundup, Killex, Weed out and Wipe out. I've used Killex and Weed out on the dandelions. My question is, will these products soak down to the dandelion roots 1 foot, or do I continue to dig them out? The holes in the lawn are many and deep. I can get soil and I was going to dry out the soil and spray it with killex prior to filling these holes up so I don't end up with the same problem. Is this the way to go?
I've told the young boy to put everything on hold until I find out more about these products and if they will really work. I only want to do the heavy maintenance once. Afterwards, general care is no problem.
I also have fairy ring, and I was told by Holes to dig many holes deep into the ground and put a mixture of Ivory soap and water on them continuously. I started doing that. I have 3 fairy rings. I've been told by many people that it is literally impossible to get rid of fair ring. Any suggestions other that what I am doing?
With all the products I've purchased, I really can't afford anything else. If elbow grease is the answer, then I will continue digging them out.
I've also the appropriate fertilizer as well as grass seed which I am sure will be fine once the weeds are gone.
Your help is greatly appreciated. I want to get started asap.
Thank you for listening and I look forward to your response. (I think)
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Roundup should work as long as the dandelions are still growing. If they are already seeding, you need to remove them without splashing a lot of seeds all over the place. There are several deep root weeding tools on the market that can help you get out the entire roots. They're not very expensive. The more precise, the better. Search on the Web for 'deep root weeding tools' for some suggestions. You probably won't find them at the hardware store. Many of these tools also come with long handles to save your back, as well.
----- At peace with weeds...
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