Buying a domain under a new name & accepting adverts

Hi there,

I am really not very good with technology so had a few questions that I really hope someone will be able to help me with!

I currently have (quite a basic) blog which you can see here: https://britishbeautyblagger.wordpress.com/

I really want to change the name and buy a domain under the new name. My questions are:
– Can I do this on WordPress? Will I still be able to use the WordPress way of blogging/posting e.g. the dashboard?
– I want my images to appear bigger on the site. How do I do this? Is it just a case of finding a template that allows bigger images? (I am using Bueno template at the moment).
– I want to be able to allow advertising and LinkWithin on my blog if I buy a domain on WordPress, will this let me?

Sorry if this is all quite basic stuff!

Thanks,

Steph x