Traditionally, 4Ps (product, place, price, promotion) is a good marketing marketing mix to start with. Later 4Cs (consumer, convenience, cost, and communication) joins the family. You can start to add more ... but ultimately you have only 3 goals:

1. can I sell my product/ service to the ideal customer?
2. Is this what I intended to do to contribute to the world?
3. is the financially viable?

Before coming up a marketing strategy, you need to have a market and a product. The very first step already a challenge people overlooked and some even totally ignore. If you can't match your product and market in the first place, how can you do marketing strategy?

I hope the above do some help to you. Feel free to drop me a message if you like to know how to find a good market and how to obtain the capability to produce a product even if you don't have the skill and money.