Some basic, productive flies that will also use materials that come in handy for other patterns:
Pheasant Tail Nymph
Gold Ribbed Hare’s Ear
Tie a dozen or so of one pattern before you move on to the next, and try to get each one better than the last. Vary colors, beads/weight/no weight and work fro larger to smaller sizes etc. if you want to mix it up a little.
Get some help picking out materials- preferably from a local shop, or if you order on line there are a number of places that specialize in fly fishing that can work with you over the phone to make sure you get the right stuff for what you’re tying (or ask for material recommendations on the board for specific patterns if you're not sure)
You may want to look into picking up one of these books. All of them offer a good introduction to tying and cover a range of productive patterns that teach a variety of techniques. If you can work your way thru the basic flies in these books, you can tie 1,000’s of patterns by varying materials and combining different techniques just by looking at a pic and recipe. Get a book that is spiral bound so you can lay it flat next to you when you tie.
Fly Tying Made Clear and Simple by Skip Morris- for many years the standard intro books for trout flies
Benchside Introduction to Fly Tying By Ted Leeson- relatively new, with innovative format with pages split horizontally to allow you view detailed instructions on different techniques on the bottom half, and detailed instructions for the pattern on top
Basic Fly Tying by Charlie Craven- just out, very detailed instructions and photos for tying, lots of tips, includes some newer very productive patterns as well as some of the old standbys.
There are tons of resources online for beginning tyers including Carlie Craven’s site ( Fly Tying Tutorials for beginners - Copperfly.net - Fly Tying Instructions
) and a series of fly tying lessons on Fly Anglers OnLine, Your Complete Internet Flyfishing Resource.
and you can find vids and step by steps for tons of stuff by googling “whateverpatternname tying”
Good luck, you'll have fun and learn a ton from your class.