Online Advertising using pay per click or pay per view. Management @ £100 per month, plus 20% of advertising spend.
Most effective marketing can be placed on Facebook, Youtube, Google, Linked in.
Suggest starting Advertising spend of £5 or £10 per day up to £50 per day.
With £10 per day budget, the monthly cost would be £300. (plus fee of £60), Then scaling up to £20 per day , then £30 per day,and beyond as sales begin to increase.