Well when आप start all आप need is a Character प्रोफ़ाइल and आप can jump in. Here's the link for that.
link
Now if आप want to start on familiar territory then start somewhere in camp which आप can find most of the लिंक्स for camp here.
link
The आग in the Middle of the Cabins. आप might even run into Hestia. So this is all आप need and have fun!