Lou,
There are countless jerky recipes here and all over the internet. Basically, with beef jerky, you want to slowly dry the meat to eliminate most of the moisture. With minimal moisture, you don't have a problem with bacteria. Your recipe can be straight beef, no flavorings added, to a complex marinade of herbs, spices and fluids (fruit juice, terijaki sauce, worcestershire sauce, etc.)
If this is your 1st time at jerky, I'd recommend selecting a lean cut of beef such as top sirloin or rump roast. Trim as much visible fat off as is practical. Slice your meat (or have your butcher do it) to about .25" and then marinade it for 24 hours. The marinade can be just about anything, but it should contain salt to inhibit bacteria. Use the find tool on this site to review jerky recipes. After 24 hours, drain your beef. The more moisture you can remove, the faster the meat will dry on the wsm. Recently I started using a 'salad spinner' to help with this step; it works! You'll want a low temp fire as you want to dry the meat rather than cook it. To help maintain a low temp a few things will help. 1) only light a few coals and use the
Minion Method. 2) use your water pan and fill it with water or sand or a clay saucer to absorb some of the heat. 3) adjust your bottom vents (keep the top vent open 100%) accordingly to keep the temps down; most likely they will be about 50%-75% closed.
Add a few pieces of wood for smoke if you desire; it won't need a lot of wood. Check for progress after a few hours. Total drying time will depend on thickness of meat, percentage of moisture in meat and temperature of fire. Your jerky may take between 5 and 10 hours to dry. Again, don't get impatient and up your temps to get finished sooner; you'll just end up cooking the meat which may have a good flavor, but is not jerky. Your jerky is done when it bends and just starts to crack.
Good luck and report on your results!
Paul