What do you mean by "fluid and professional"? Are you saying the purpose of the site is to impress people with how fluid and professional it is? So it loads into a browser or on mobile smoothly and quickly? Those "qualities" should be a given for any business-oriented site. You need a site design with content and functionality that is going to achieve your business goals. Also, whatever you come up will be imperfect out of the gate. It's impossible to have a perfect website, ever, but...
Aimed at “lifelong learners” rather than beginners, Udacity is firmly focused on teaching specialised skills to help people in the tech industry get to the next level of their career. Courses are focused on high-end topics such as autonomous systems, AI, machine learning and full-stack web development, and are built in partnership with Google, AT&T, and Facebook. 
The best place to find themes is through WordPress’s own Theme Directory. Search for the types of themes you’d be interested in. If you’re setting up a newspaper search ‘newspaper’, if you need a site for your café search ‘cafe’. There’ll be dozens, if not hundreds, of contenders. Clicking on a theme takes you to its own page where you can see user reviews and preview the theme in action.
Doodlekit is one of the most unusable and unintuitive website builders on the market. Editing the limited number of templates is confusing and convoluted and taking advantage of the advertised features is more trouble than it’s worth. Despite my extensive history with site builders and web design, I found myself confused and frustrated when trying to make even the simplest changes on my Doodlekit website.
Free learning resources are one of the best things about the Internet, but employers are unlikely to hire you based on what you learnt for free without earning a qualification of any sort. However, prior to getting a paid education, you can try a free course to see if you enjoy it and see if you are any good at it before you invest your money into a qualification. website building course
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