"A plan is a list of actions arranged in whatever sequence is thought likely to achieve an objective." - John Argenti

The marketing planning is a necessary activity, due to complex competitive and hostile business atmosphere. Our capabilities to ensure profitable sales are affected by hundreds of internal and external factors which are not easy to analyze. A marketing manager must build an image and take rational decisions.

Internet marketing – takes a day to learn,  but it takes a lifetime to be a Guru. 
 

If the circus is coming to town and you paint a sign saying "Circus Coming to the Fairground Saturday," that's advertising. If you put the sign on the back of an elephant and walk it into town, that's promotion. If the elephant walks through the mayor's flower bed, that's publicity. And if you get the mayor to laugh about it, that's public relations. If the town's citizens go the circus, you show them the many entertainment booths, explain how much fun they'll have spending money at the booths, answer their questions and ultimately, they spend a lot at the circus, that's sales.

Basically there is not much difference between online and offline marketing. For doing proper planning you need to take help of an expert. You got to learn its ins and outs. Once you learn it you are well set to make a lot of money.