A few Overlord questions
1. You should be telling them everything, INCLUDING reinforcements and rewards. It is important for heroes to know reiforcements because it affects strategy- if a shadow dragon respawns every turn, why take the time to kill it (instead of disabling it, for example.) If the dragon is gone for good, might be worth the effort to finish off.
2.By the book, there is no problem including all the expansions. However, it is supposed to be decided before the campaign starts, and an expansion should be included fully or not at all. (If OL has access to monsters that can weaken, heroes should have access to classes and gear that weaken, too.)
3. This varies group to group. Community! Assemble!
4. I'll PM you.
If you don't want your players to quit and your investment flushed down the toilet you need to tell them everything in the quest. It sounds like you don't natively speak English so it might be a good idea to find an OCR reader for all the quests and translate them for the players. The only hidden information you can hide as the OL are the OL cards you're holding. Preventing information other than that is borderline cheating.
Edited by CursainFirst of all the campaign book is totally open information, there is no secret whatsoever and in fact it's best to let the heroes read it themselves while you are picking your open groups to avert "you forget to tell me this"-anger-arguments, because you explained something when they weren't paying attention.
It also helps to point out some key points so everyone is on the same page (tell them what you can reinfroce where, what your goal is, what their goal is, in which rooms you are going to place your monsters and so on).
What should you do to keep them interested in the game? That's a good question. If one side steamrolls the other it often helps to give the rewards for winning to both teams, give the losing party some additional gold and especially tell them where they made suboptimal decisions and help them with skill selection if they keep ignoring the importance of positioning.
Imo as long as both sides aren't even in skill-level, there is no nead to be strict about rewards and so on, just make sure both parties are on a somewhat even ground, so your games stay exciting and challanging for both parties.
Another thing that worked reasonably well in my group is to bargain with the heroes, when they start to say "I don't care about the objective anymore, it's unwinnable, let's go for the search tokens instead." You can offer them 90% of the searchtokens they are likely to get, if they try to go for the win and fail (or even 100% if they are really far behind). This always makes for a much more fun and exciting finish and the heroes won't be angry if they don't make it, because they didn't get nothing.
Always try to help the weaker players to learn the game, if they are intrigued by the game in principle and want to keep on playing, you can even give them hints during the game. They will get better this way and until everyone is roughly on the same skill level, try to lift them there and make these games as enjoyable as possible (by keeping everyones resources on par or give the weaker team an advantage). There is no fun in losing on prupose to make them feel good, better give them an edge on you and fight against the odds as hard as possible. This way they will win by their own tactics and you lose against overwhelming odds, which feels much better than winning/losing, because someone intentionally handed you the win.
Edited by DAMazThank you all for your answers, I will keep in mind all your suggestions. We play in a game store owned by a friend, so it's easy to pick up players, but is hard to keep them (we are all adults, and the time is a constant issue). Zaltyre, I'll PM you once I start translating the campaign.
3- Have patience. Your hero players will get better as they accumulate experience from playing the game. Once they know how to use their strength to their maximal potential. they will make better choices overall and therefore be able to compete a lot more with an experienced overlord. I started like you and now my players have caught up with me, making it truly challenging for me.