Weebly makes SEO relatively easy for any page that you create - the SEO tab has all the options you need. Makes sure that when you create you website and pages that you fill in the following: Page description and META keywords. On top of this any image you add to your site make sure you add an image tag as well.
I have learnt that SEO is a full on project, to get the results you want (higher placings in search results) you need to be constantly working on the website and submitting pages (I use Google and Bing webmasters).
From my limited experience it seems that changing words updating content and then submitting the pages to search engines seems to be the way forward
I managed to get one of our pages up on the 2nd page of a Google search not too long ago but as I didn't follow up with actively updating the page this soon disappeared.
If SEO is important to you then be prepared to put the time and effort in to get the results.
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