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If you're talking about ring classes just look them up on the Wikipedia. Most of the time, the classes most effective are the melee classes. After floors that have been frozen, there is the first set of floors that have been abandoned.
1 - and 2-. Dung is rather slower at lower levels so you're unlikely to earn excessive xp. Figure out how fast you go through dungeons and also how much xp gain you'll get on average per dungeon. C1 or C6 is based on the speed. If you can do an c1 within 2 minutes and gain 55xp, the c6 which takes 20 minutes and yields 650 xp is more effective the xp. 20 minutes/2 minutes = 10. 10x55xp = 550 xp in the same amount of time C6 could earn you 650xp.
Every-time you complete your maximum floor , you have to start over. "Do I attempt to do the smallest floor in each class?" I don't know what you intend to say by this question. The tendency is to rush for more xp but doing all rooms may be more relaxed. That's a personal choice. There are xp bonus points for the number of monsters that you defeat and the rooms you go into. The bonus for entering rooms is greater than that for killing monsters, so make sure to enter every room , but only kill monsters if you need to.
That's personal question. What do you like doing more? Training in one spot or dunging to learn a variety of things? Fractite, the dung equivalent of rune. You can utilize up to level 40. Based on your training method. If you are using a guide you could probably get through them all in a single day. I'd guess that you could play for 10 hours at a time for each one, except for the three you suggested.
You will need to decide what you're planning on doing. Higher strength is generally used by those who are able to pk/duel. The range and the mage are at the same level it won't change your level of combat until one of them takes over your melee combat. Normal oak-willows are typically used to train in woodcutting. I would consider selling oaks, however willows I would use for burning.
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