Hey Comrade,
I scanned this journal... I really respect the hard work and props to keeping a journal!
I manage PPC profitably for many small businesses, including my e-commerce startup. One client spends over $100,000/m. I started PPC back in October 2012 and have been grinding my way up ever since. The first two months were rough, because my fundamentals needed improvement... so just hang in there!
Based on your posts, I think you have a pretty big flaw in your PPC fundamentals right now when it comes to keywords.
You're focusing on your landing page a lot, which is truly great, but it seems that you treat keywords as an afterthought.
It doesn't matter if you have the best landing page in the world, if you are targeting the wrong keywords, your campaign won't be profitable. Additionally, it's helpful to build landing pages based around keywords and what the searcher is looking for.
A lot of the advice you are reading is in regards to display advertising (POF/Facebook) and you are doing search advertising.
Think of keywords much like demo targeting on display advertising. Getting a campaign profitable on display advertising is all about tweaking and advertising the demo until you find the perfect demo. For Example, the perfect demo for Supplement A and Landing Page B may be Males 32-36 who are College Educated (indicates higher disposable income) and single (they may be interested in losing weight to attract a mate).
A similar concept applies to search advertising. Let's take two different search terms:
"Information about Diet Supplements"
"Best Diet Supplement to Lose Weight"
Keyword A is trash, Keyword B is much better.
The searcher in keyword a is a browser, he's just looking for information right now about diet supplements. He may convert, but it's going to be much tougher.
The searcher in keyword B has already been browsing, and now he's looking for the "best" supplement. This signals he is much farther in the sales process and is much more likely to convert.
Regardless, you don't have to be great at picking keywords right off the bat, it will take time and experience in the niche. What you do have to be great at is:
A. Tracking Keywords Properly.
B. Bidding on only a small set of keywords, so you can split test quicker.
So you've had a couple of sales already. What keywords did they come from? If you can't tell me this, then you're not tracking keywords properly.
Secondly, how many keywords are you bidding on? If you are bidding on 20 different keywords, then it will take you forever to figure out which keywords convert well and which keywords don't. Take a serious look over your keywords and pick 3-5. This will help you determine the winner and loser keywords much quicker.
Also, make sure you are properly using keyword matching. If you are using naked broad matching, then you're going to get hammered and not make money. Use Exact Match, Phrase Match, or Broad Match Modifiers, but never naked broad matching (especially if you're new to search advertising).
Lastly, You shouldn't have your 3-5 keywords all in the same ad group, even the same campaign. Each of these keywords should have a separate campaign. This is for many reasons, but most importantly so that you can create different ads for each keyword.
You don't want to run the same ad for keyword "How to Lose Weight" as you will for "Best Supplements to Lose Weight". This should be obvious to you, because Quality Score is heavily determined by AD CTR and AD CTR is heavily determined by ad relevance to the keyword.
If you're bidding on "How to Lose Weight", then your ad copy should mention the phrase "How to Lose Weight" AT least once, and it should probably be the Ad Title.
Long Rant, but hey, I think it will help you
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TLDR: Proper Keyword Research, Campaign/Ad Setup, & Tracking is just as important, if not more, than Landing Page Optimization.