Ankle support vs. no ankle support - you'll find plenty of people on both sides of the fence on this. I used to wear heavy, mid-to-high hiking boots in my 20's, when I started hiking - I didn't know any better and just took the advice I got from a local shop when I started buying outdoor equipment.
I have since learned that I do far better with less support and more comfort. Several reasons why:
1 - high support hiking boots don't actually give you much extra support. Sure, actual mountaineering boots do give support (but take away almost all comfort), but typical hiking boots do not. You can try this for yourself, just put on a decent weight pack, and carefully roll your ankle out while wearing both high support boots and typical trainers. While it may feel more secure having material around your ankles, you'll notice that there's almost no amount of tension on your laces that will prevent the sensation of painfully rolling your ankle when presented with the load of your body weight and pack.
2 - heavy hiking boots actually encourage more rolled ankles, trips, and slips. They're heavy, which means your feet are less nimble. They're higher center of gravity, which means your feet are more likely to roll if placed off center. They're wider, which means you're more likely to trip on roots and rocks. They have thicker soles, which means you get less tactile feedback on your terrain. Basically, heavy hiking boots need to claim extra support since they're practically setting you up for the fall.
3 - heavy boots actually create much more load then just their weight. Most articles I've read about this state that an extra pound on footwear is like 5 extra pounds on your back. That's a serious weight differential, and another factor in both comfort and agility
4 - No waterproof boot is actually waterproof. And once a waterproof boot is wet, it will use it's waterproofness against you to slow down the drying process. Far better, in wet weather, to have shoes that drain and dry quickly. The only situation that you need waterproof boots is when hiking in unpacked snow, but even then only if you don't have proper gaiters
But these are just my opinions based on my hiking style and how my feet respond to different types of shoes. Once you actually gain experience hiking and trying out different styles of shoes, you'll figure out what you prefer.
However, for a novice that doesn't know yet what works best for them, there's no question in my mind - go with something comfortable, not heavy and clunky. Trail runners are a perfect compromise, but I would even rather go with running shoes over heavy hiking boots.