Digital Marketing should be fun. If you do it right, it takes very little time to run.  The setup is the hard part. The rest is easy.

I've said to many prospective clients that most of the "brain" work is in the setup. 

This means hiring skilled labor in the initial phase. It falls on deaf ears, but the truth is the grunt work of running channels and keeping current is a different task from the design and architecture of your media approach. Businesses have not figured that out yet. 

Most businesses do it arseways. Pay peanuts, Get monkeys.

I tell them there are two distinct elements, setting up sites, linkages and pages, developing an initial brand, formulating a customer persona, understanding your competitions strengths and weaknesses, knowing your USP and figuring out how your site is performing (or not). 

After that there are vectors, tangents and lines of attack. If you want customers, it pays to develop outreach, if you're working in the B2B sector you need to find the decision makers. If it's event or seasonal, you're building out calendars, working the bang for buck stuff (some people call that growth hacking, but no business is set up to lose customers and revenue unless it's a tax scam).

There are so many decisions to make, all incidental, incremental and instrumental.  After the first six months are done, you should have a proper control center. If you don't, look to your history and performance across your channels and benchmark it. 

 You can of course hire that cheap intern and convince yourself that Facebook is the only way to reach your audience...it takes all kinds.

Note: If you're doing Bing Ads, we don't know what the process is ...it seems to be run by that guy who sat in the back of class digging his initials into a desk.