few questions on reloading

I have a few questions on reloading. i have watched a few videos about reloading on youtube but haven't read any books as i ha vent made it to books-a-million yet if they even have them there. a few videos i saw on reloading .30-30 they said the case must be trimmed before reloading and others say the case does not need to be trimmed just have the primer removed and cleaned. so witch is true? also how many times can a case be reloaded before it is junk i would figure they would get weaker after x amount of times since it is a mini explosion in the case. I have a good idea of what i need but feel free to correct me if i am wrong. I think i need a press, dies for .30-30 and .223(i would be reloading both of those), primer tool, digital scale that can read granes, primer pocket cleaner, case lube, powder funnel(not sure if that's the proper name) and a powder spoon and of course a good reloading manual. I think that's it i could be missing a few things. i will mainly be doing .30-30 since i own that and my brother has a .223 so i would do rounds for him and once i get more guns i will get more dies.