My advice is: Save a lot.
Save before you level up. Save after levelling and continue. If you find as you progress through a section or area that you "mis-allocated" your points, feats, or level, go back to the "before you levelled" save and choose differently.
If you're going to multi-class any characters, plan it now, at the beginning. Your plan will change and deepen as you progress through the game, but because around level 10 you're going to get much more locked in in terms of deciding how to maximize the strengths of the "major" class of a dual/multi-class character, you'll want to have some idea in the early levels which class to level each time. This also affects your allocation of feats and skills to some extent-- my dual-class Monk of the Old Order/rogue doesn't need any feats in Spell Penetration, but a Monk of Mystra that you intend to dual-class to wizard or sorceror would, so all of the points that you don't have to put into Weapons Specialization (because it's a monk, who fights better unarmed) can go to Spell Penetration, even before you have actually dual-classed him/her.
And of course you have to consider how you're going to work around the penalties and blocks beforehand. If you are going to try something bizarre, like I did, and take an Aasimar, start her as a Pally (which is her favored class), then dual her to a barbarian, you will want to make some decisions, because once I dualled her, she couldn't go further as a Pally. So-- did I want her to have spells? That would mean that she'd have to level as a Pally to at least level 4 before I dualled her. And if you plan a Wizard/Rogue, but want to give him/her a couple of levels of Fighter first, for the HP, you run the risk of getting a penalty between the middle-level class and the Fighter class, even if the character is human (since only the highest level is ignored, if the other two classes are more than one level apart, you'll get the penalty).
So most of the things that you have to "keep track of" are during character creation. After that, it's mostly a matter of playing the game and seeing how your choices play out, and thinking up clever ways to make the choices that didn't work out how you planned, work for you anyway [img]smile.gif[/img] .
|