Most definitely, yes. The goal of a Landing Page is to acquire leads, which are - most often - obtained by having them fill a form
There is not recipe around this. Make it as long as necessary to convey the message helping your visitors convert. Remember though, if your page tends tot get above 3 sections or more, to include a Call to action at the end.
Ideally you should find your cadence. It can be anywhere between daily to once or twice a week. Always make sure to publish original content and to always prune your pages.
Most of the time people will share your blog post on social media channels. So make sure that your featured image fits the specs of the most common social media channels. For Facebook, Twitter and LinkedIn a sweet spot is 1200px by 630px, or anything above which matches this ratio.
Make sure that each time you publish a new ad, your landing content matches the value proposition presented in the add. This will increase your conversion, which in return will help you achieve lower PPC costs.