Hi,
When buying shares in any thinly-traded security, I always use a limit order. If you place a market order you risk the chance of getting caught with any ask or bid, which might be signficantly different than the last trade. Also be patient. You may not get a resonable offer price on any particular day. As Mitchelg notes, buying an ETF makes some sense. I would watch the expense ratio though. If you want to look at individual issues, try to find some of Richard Lehmann's columns from Forbes magazine. I've found most of his advice to be pretty good, although not perfect.
Regards,
Duane