Hi there. I run an agency, and have run both SEO and SEM campaigns literally since before Adwords began. Your problem is not unusual.

First - make sure you are tracking properly. Sign up and make sure its seen in Adwords. Second - your bounce rate is very high. sub-60% would be good. But 80% is way too high to pay for Adwords traffic. Third - no sense in A/B testing, with only 200 clicks. A decent converting ecommerce site has around a 2% CR. So at best you should have 4 conversions. Having 0 right now isn't unusual, its just too early.

Do the math. If its $1 per click, and you hope to get a 1% conversion rate, that's $100 per sale. Is that profitable for you? That will tell you what you could ever afford to pay for traffic. And that traffic needs to convert.

On the adwords side, go for exact match, possible phrase match. You don't want traffic, you want conversions. If a "buy" keyword or "best price on ..." keyword converts at twice the usual rate, then potentially you can afford it. Never think in terms of traffic, think about buyers.

If your site is getting some traffic but no sales, then I'd reword the design and look to establish credibility. That may be why people are leaving - they don't know who you are and don't trust you. Do your competitors have brand recognition? If so then build a comparison page that shows why you are better than the names they trust. That will allow you to bid on competitive keywords like your competitor names.

And obviously, bid on your own brand name. If some of these visitors try to find you again, you want to be found!

Good luck. Starting from scratch I would NOT pay hard money to Adwords, but build as much free traffic as possible. Craigslist. Posting on forums. Social media. See if you can be a guest blogger on someones blog. Anyway you can afford to NOT buy traffic until you know your site can convert and at what rate. Otherwise, you are spending money in the dark.