The type of trek in Nepal suitable for you depends on your budget, fitness level and available time. You could carry your own pack and tent and use your skills to navigate the trails. You could also hire porters to carry your heavy luggage and carry a small pack by yourself. You could even hire a guide for the trip.
You could arrange a trek through a trekking agency either in Nepal or your home country. The trips could be arranged with overnight stays at lodges on the way or the one involving camping on the trail.
Please visit the popular treks in Nepal to get a brief idea about about the trekking routes.