As far as going after Avies, there seems to be 2 major schools of thought. When I first started, I liked maxing out my prayer gear, using poisoned emerald bolts, and finding a quiet world where I could attack every Aviansie in sight, all at one time. It's a great way to accelerate your drops, but it's hard to find a world where nobody's already there. Eventually, I started tanking them. No Prayer, just my best ranging armor, and the Bones to Peaches spell. Plus the Enhanced Excalibur. After getting the second enhancement on Excalibur, it's been very effective. My Hit Points are 990, I heal with Excalibur at around 600. Every now and then, I eat Peaches or the Swordfish they like to drop. It's easy to stay as long as you want this way.
There are plenty of guides showing how to get there, and how to fight them. But I thought you might be interested in seeing what gear I wear and take with me. So here it is: