Ranking Homepage against Internal Pages?

Hey Guys,

I have been hanging around the forum for a while now ( as a guest) but thought it would be a good idea to ask a few questions of my own and hopefully give back whatever and wherever I can! .

I am starting to get into affiliate marketing using clickbank to find potential products. I stumbled across a product today that I thought would be great for me to promote as it is linked to the industry that I used to work in and thought that I could use my knowledge of to create a landing page with relative ease.

Just for this example we will say that the product is a registry cleaner for your computer. I used the google keywords tool and found some suggestions with relatively high searches and low competition (according to the tool).

Lets say the suggestions were:

"registry cleaner"

"registry cleaner download"

"registry cleaner windows 7"

I then decided to check the backlinks of the pages that were ranking highly in google. I used the 6th or 7th site in the google search results. Lets say I searched for "windows 7 registry cleaner" and the site was:

"thebestregcleanerintheworld.com/windows7cleaner" made that up just now good eh?

now obviously this is not the homepage of the site. I used majesticseo and ahrefs to check the backlinks, which both come up with under 20 for the phrase that I want to rank for.

However when I check the backlinks for the homepage of the site:

"thebestregcleanerintheworld.com" it comes up with over 500.

Obviously the homepage will be ranking for many different keywords and phrases.

If I were to create a landing page and try and rank for 2 or 3 phrases, focusing on "windows 7 registry cleaner" which the other site has 20 backlinks for would I need to get more than 20 or more than 500 as the homepage of the other product has 500 backlinks.

I hope this post wasnt to long winded or confusing!

Aspirexx