As far as Poker goes (at least for Texas Hold’em), I’d recommend sitting at a low stakes table (1/2 no-limit is the lowest most places have) and merely being observant/make casual conversation at the table for a while until you feel comfortable. If you’ve never played, just tell the dealer and they’ll be happy to help you out (most players will notice if you haven’t played before anyways so you’re not really at a loss there). Just play “tight” (a small range of strong starting hands) and that’s a pretty good place to start!
Your Deals. In addition to establishing a per-class price, also offer packages to entice people to sign up for more than one class. For example, if you intend to host classes on making soap, offer the classes individually, as well as in a group. Someone could take a class learning how to use fresh flowers in homemade soap, or they could buy a bundle that teaches them how to use those, fresh herbs, and plastic toys for kid’s soap. However you decide to price your classes, remember that the buyer will want to feel like they’re getting a lot for their money. If you can provide that in a fun atmosphere, they’ll likely be back time and time again – and they’ll bring friends.
Research Pricing (And Set Fair Starting Prices): Before setting prices for each item, research your local Craigslist website and (if possible) nearby yard sales to get a sense of how to price them. Remember that many buyers will try to haggle – so set prices a bit higher than your bottom dollar, but not so high that you’ll scare off first bids. 10% to 15% is a good rule of thumb. Consider bunching low-value items, such as old CDs, into lots of five or 10, or offer x-for-$y deals.

Note:  There are dozens of other survey sites out there. These just happen to be the more well-known ones that have a reputation for paying out in a timely manner and not having impossible standards for cashing out. As always, be careful with your personal information. I recommend using an entirely separate email address for survey sites so they don’t clutter your inbox.