Making a campaign is very doable, but it's managing it and reacting to shifts in demographic targeting and engagement that is often difficult and takes time. I've priced this at the lowest I possibly can while still making any money whatsoever - because I enjoy it, it's not immediate or requiring of weird hours, and fun.

AdWords / YouTube

I've scaled this with the complexity of your project and the attention/hours required of it, because that seems only fair. If you want to create a campaign that's pretty much set-and-go, great! I only ask for a few dollars a week to keep up on those once made. If it requires a lot consistently, it'll only increase accordingly.

Combination

Creating an ad campaign that hits on multiple fronts is always recommended when possible, and will get a much broader spread of users. Whether as a blitz or a sustained campaign, trying to get the greatest visibility is always a good idea. Usually doable for only a few dozen to a few hundred dollars per week.

WordPress is the most extensible of all of the WYSIWYG systems, and has the most plugins and pre-made themes to work into a new site. Cost may include the price of a template, if you have one in mind that you need, but at $250 starting, it will always be ridiculously cheap for a full-fledged website with e-commerce.

Wix / Squarespace

Wix and Squarespace are both fantastic at being self-contained systems that have plugins that are made and monitored by their respective teams themselves, and are therefore far less prone to security or outdating issues. Fonts, formats, parallax, pages, style, themes, e-commerce, and more are all options.

Coded from scratch

This can take up to a few weeks, depending on how unique you want your site to be, and will likely take all of my waking hours in that time if it's very complex. But all of that time and effort is to give you unparalleled control, user interactivity, and access, in a website that is designed from the ground up just for you.