I'm not an expert.
I'm solidly in the mediocre camp lol. I only use adwords for 2 businesses I own and dont do this professionally.
However I have invested about $15,000 into the school of hard knocks and hands on training. My ads are now profitable and have a ludicrously high ROI. I also now have a google adwords consultant that google gave me to answer any high level questions. (This is because I tagged my business as HVAC, not because of how much I've spent. I guess certain business sectors are very profitable for google so they want to help you? *shrug*)
Again I'm not an expert and I'm sure there is a wicked smart marketer on here that does this professionally that can help but let me see if I can start you with the right questions.
1.) What are you struggling with? Are you getting a lot of crap clicks? Are you not reaching the right people? Are you not reaching enough people? Is your budget just being pissed away?
2.) Can you give us a rough idea of the industry? It doesnt need to be specific, but different industries have different strategies and wildly different Cost per click. For example, my "easy" business, clicks are less than a dollar, for my "hard" business qualified clicks are around $50. Is this retail or service or something else? Is it a local business or an online business?
So that is adwords, lets discuss the big picture marketing questions as well as key metrics.
Have you read "The one page marketing plan" ?- Its my favorite marketing suggestion for people. The two highlights you should take away is that you need to know your ROI from marketing activities and that also you should be focusing on growing a referral marketing system where your customers are out there advertising for you. For one of my businesses I have reached a critical mass with referrals alone outpacing what I can handle. I have reduced my google ads spend by 90% and the remaining 10% is for services that are 3x more profitable then my average service.
Now this last one is completely unrelated to your question but I like to share with people. If you business is already functioning, do you know how you compare with your industry peers? Would you like to?
https://businessreferenceguide.com/subscribe-business-reference-guide-online/I'm not affiliated with them in any way, I only share because I find it useful. You can subscribe for a one month subscription (And cancel before it renews, it wasnt any trouble) and download all the data you want. It will include a template for your industry that shows all kinds of key ROI metrics that you can benchmark yourself against. The reason I mention this is one key metric is advertising spend as a % of gross revenue.