You have to provider at least some information (what kind of application, expected traffic, design, what level of HA is required, what's the probable bottleneck, etc.)
Also, the type of application is an easy concept for booking (via online form) vacation experiences, so it has terms and conditions, explanations of our service, cities in which we're offering it and not much more
At this point, that's it IMHO. I wouldn't even use an ELB or auto-scaling at this point.
If you need help, drop a mail, I have spare time I can help you with the specifics (free of charge ofc).
ps. AWS has a learning curve and is not cheap but saves you a great deal of sysadmin management and most importantly, saves you from probable fire-fighting at this stage, plus there is the free tier will get you nearly a year without charges.