1) Fonts ans sizes are controlled by the theme's stylesheet. Go to Appearance > Editor and select Stylesheet (style.css). You'll have to do some digging to find what you want. However, some themes give you the ability to change how things look without digging around in the code - in that case, there may be an Options page under Appearance that you can use to make the changes easily yourself.

2) Are you trying to center or align it with the visual editor? If you are, and it's not displaying properly when you publish the page, there may be something wrong with the theme. If you switch over to the html editor, you can manually add something like style="float:left;padding-right:10px;" (which will align the image left) to the img tag of the image you're inserting.

If you need help, PM me or check out my sig

do you mind sharing the address of your website? These problems can be quickly remedied by sharing the url and the name of the theme you are using. I understand the site's url may be sensitive because of marketing purposes but it's the best way to quickly fix problems.

Yes, please share the URL. I'm quite familiar with the Flexibility theme. Unless there's some special formatting in your sidebar widgets that you're using, the font type and size should be the same throughout the blog and sidebar. I've not had problems with image alignment with this theme either, so I'm not sure what to suggest without seeing the site.

Yes I can help you..

I sent you a PM with my contact info.

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