I am incredibly excited but not sure what to expect. Have you experienced PH effect? How long does it usually take to realise the true impact, whatever that may be?
You cannot control who links and who clicks on the internet.
Architectures like AWS, with elastic databases, server instances, load balancers, bandwitch, ELBs and iops, auto scaling groups, etc... elastic horizontally and vertically, pay peer use, free tier available.
You can scale manually when needed (pre-scale-up and post-scale-down), or based on ELB visits, CPU/ram/load of instances behind the balancer, etc...
Just be sure to don't loose your logs if you need them, when instances are terminated by scaling activities.