I know you said opinions about the layout, but I am wondering about this: "I have had a lot of experience with [...] web development (HTML, PHP and SQL)"... you clearly don't, you even admitted "I'm not a pro or anything so i've just used a WYSIWYG editor".
The general layout (with the correct design) would be ok I guess, but your design doesn't do it any favours.
Other things I have noticed:
- Don't bother telling the user what browser / screen resolution to use, they won't change because you say so.
- The image on the homepage is way too cheesy, it doesn't portray a professional image.
- I cannot click the links in the footer on your homepage... ironic as I am using Chrome

I guess how much effort you put into this should be proportional to the seriousness of your business, if it is a hobby to earn a couple $$$ then fine, if this is your main income you should probably hire someone to do it for you.
ILMV