Making a comprehensive Marketing Strategy?

[DSleeper]

Hey all,

I am the Marketing Manager for a smallish (around 30 employees) company with no direct supervisor and no assistants. I am around 3 months in and due to the amount of work, have mostly been creating campaigns ad-hoc.

We have a large amount of different sales channels both B2B B2C and have just been tasked with creating a real marketing strategy with budget and schedule on top of the rest of my work.

I know this will be useful in helping guide me going foward but...I really don't know how to make this accurate and practical. I have downloaded templates and guides (including Hubspots) but we are past the general SWOT and buyer persona level.

Are there good sources for determine resource allocation, timing of campaigns and projects, PPC budgets? I am willing to outsource this as well if it is really practical. 

Any advice appreciated.