The questions are rather generic and there are lots of articles and posts giving generic answers, so I'll just post a short reply.
1. I invest in Charlotte area, properties for good CoC and appreciation have been hard to find (if you're a conservative investor.)
2. Do you have the time and the skills to do it on your own? If so, that's probably a good way to start, if no, you'll be in over your head.
Do you know a good, trustworthy contractor? If so, use them. If no, you'll likely lose money if they do a shoddy job or charge you way more than quoted at first.
If the answer to the last 2 questions was "no", then buying a turn key property (or partnering with someone who has more experience} is probably your best bet. Still make sure it's not overpriced and the neighborhood is at least decent. Buying in a bad neighborhood usually leads to regrets.
3. There are probably as many answers to that question as there are BP members :) There are lots of posts discussing this.
I expect house prices to come down but probably not nearly as much as during the last recession. How long it takes will depend on government policies & economy in general.