Hello marcobannink,
I am an experienced (5+ years) Google Analytics Academy certified professional (I can mail you the certificate), I have been working as an SEO and internet marketing professional for 5+ years. I have delivered many projects with targeted goals.
I will first study your product/service format, sort out your targeted customer segment(s), geographic location for the sales of your product/service. I will then analyze the traffic to your website using Google Analytics. Use it to find out the origin of the potential visitors, referrers of these visitors, media (desktop OR mobile devices) of these visitors, and many more such useful data which I will use to further enhance my internet marketing campaigns.
For first month I will use SEO (on-page and off-page), Social media marketing and campaigning(facebook,twitter,youtube,linkedin,etc.), and also hybrid marketing (online+offline marketing ) to promote and market your products/services. At the end of the month I will analyze the impact of all the effort on the sales and sort out all potential channels. During the next month I will enhance my existing methods by using the data I obtained from the previous month's performance analysis. On the 3rd month , i.e the last month, I will boost up the sales using the PPC(pay-par-click) like Google Adwords and Facebook Ads. I will try to keep the budget and the bids minimal and only to the targeted audiences to achieve the best ROI from it.
I will give my best to this.