What to buy (new to marvel comic Universe)

Hello all,

Like many, after watching the Marvel movies I became also passionate about the world of Marvel comics. I wanted to ask for some suggestions on which saga to buy, unfortunately for me I'm crazy for single volumes and I'm noticing that they are difficult to recover even those released more recently. I wanted to maybe start with a saga with only few issues. Also, if anyone knows a site where it's convenient to buy, considering that I live in Italy. Thanks to everyone!