National ideas are buffs that will help your nation grow. There's no such thing as a "national penality" so all national ideas give some benefit. It's just that some benefits are better than others. As suggested, some of the buffs really don't do that much for a nation.
In the beginning, unless you're familiar with the EU universe, the nomenclature, and the game mechanics (I assume new players were like me and jumped in knowing nothing about the game), some of those national ideas might not make a lot of sense or may mean something different than you think they mean. As
@ThatRabidPotato suggests, in the hands of an experienced, decent player, national ideas can be used to do some pretty amazing things. For newer players, who may not even understand what the buffs are, they are still there and help you but you may not be able to take full advantage of the benefits.
To me, then, national ideas are less important than picking a nation that will keep you alive and not rage quitting. From your original post, it sounds as if you know - and are not interested in playing - some of the generally accepted easier starts: England, France, Castile, Portugal. These obviously will be easier games than starting as, say, Nanbu. If have an interest in one of those, certainly pick them.
But from the list of nations you stated you were interested in playing, Muscovy is probably the best bet. You get a mission against Novogrod, which is fairly easy to take over in a couple of wars, giving you early game access to a trade node (more money), as well as more land. You have vassals to help you fight. You can learn most of the basic mechanics of the game, except for ocean exploration (you can explore and colonize the Siberia area).
Otherwise, try to pick a nation that (1) you have an interest in playing and (2) pick a nation that has sufficient land or is in a sufficiently defensible position that, in the event you find yourself in an early game war, you can either win or prevent your nation from being destoyed.
Also - I really, really suggest this - play with Wiki open and use it often.