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if you whant to make blog - so you need to use some blog scripts (cms). Wordpress will be fine.

Just setup and configure it. It's not so difficult so anyone can do it

the best advice is to use some sitebuilders with gallery modules, or special gallery scripts. It's very easy to use and you can make it by using tutorials. you need to configure script only once and...

it's not a good idea to use redirect's like this. i think google can punishfor it

What is the main idea of your site? To show random picture? So why you're not using gallery scripts to do it?

It depend of your skills. If you can make your own - do it, but i very offten using a free site builders with chat module

It's very easy to modify and work with it

Are you shure your gif's are the same width?