Hello. I will assume you have seasoned you smoker. I don't know where you are or from so I don't know your idea of what is Mexican. I am from south Texas so Tex-Mex is my idea of Mexican. As this is your very first smoke let's keep it simple. You need to take some time and learn how your smoker works but as you already have a dinner party planned: Steak tacos. Start with some steaks. They don't have to be ribeye. Just some nice steaks cut maybe 3'4" thick if you can find them. Add salt and pepper just as you would for any cooking style with these steaks. Then add just a pinch of chilli powder and a pinch of ground cumin to each steak and rub seasoning into the steaks. Don't over season the steaks. You will want to taste the smoke. Pre heat the smoker and smoke them at 300-325 until JUST medium rare. Take them off the smoker and wrap in foil. Allow to sit for about 30 minutes. Then slice them very thinly and pour the foil juices over the slices. Serve the steak slices in tortillos ( corn or flour ) with chopped lettuce, tomato, minced onion and guacamole ( easy recipe below from a Tex-Mex restaurant ). Add as sides: pinto beans or refried beans ( preferably homemade, canned if not will have to do, add some salt and pepper and any other spices you think it needs to the canned ones ) and Spanish rice. If you don't know how to make Spanish rice, Rice-a-Roni Spanish rice is a very good cheat and easy to do. I know it's simple but you need to start easy and work up in my opinion. Hope this helps.
2 VERY ripe avocados
1/4 tub Philly cream cheese
dash of salt, black pepper, onion powder and garlic powder to taste
Mash the avocados well with a fork. Stir in remaining ingredients and taste for seasoning.
Some folks add a squeeze of lime but I prefer not to. If you don't add lime make this at the last minute or it will start to turn black.