It's really hard to get you some perfect solution for this, as it really doesn't exist, you have to adjust it to your personal needs and requirements, and align it with your audience so that your ads can really catch their attention and reach them out. Some general rules for good Google ads are that they should be short, brief, concise, they should include targeted keywords (especially Search network campaigns), they need to have adequate URL from your site that they will lead to, it's recommendable using some extensions here, and so on.
From the creative side, for campaigns like Display and YouTube ones, it's also desirable to make them engaging, to include some appealing CTA buttons to them, to present your offer in an interesting way so that you can attract more clicks and bring a higher volume of traffic to your site, and similar.