Installed, but few warnings

[Kosta789]

Hi,

I have installed PrestaShop for the first time (I am testing it) and it looks really good. But when I opened the page, it was:
1) too slow
2) there were warning

I don't know if the speed of refreshing is caused by PrestaShope or the site where I created my web (it is free domain), what do you think?

And what should I do with these warnings? (the config file has 777 permission)
look: www.kobar.wz.cz
It is same in the administration of the web, everywhere how can I fix it?

Thank you for answers

Kosta789