Assuming your DM can't or does not want to make the campaign more skill-friendly, and assuming you still want to play a rogue, I would suggest the following:
1) Don't go the melee route. Rogues don't have the AC or the HP to stand toe to toe, so getting the flank for the sneak attack will get you killed pretty quickly. On the other hand, your presumably high Dex will make you a good candidate for the bow tree.
2) Get the party wizard or sorc to take Glitterdust. Granted, this won't help you against undead, but it will give you many rounds of sneak attacks against more vulnerable foes.
3) Max out Use Magic Device. You can really save the party's bacon if the cleric goes down and you pull out the wand of cure X.
4) Max out Spot and Listen. In my experience, party spotter (or more than one) is a very important role. Not being surprised can make a huge difference in an encounter.
--Axe
1) Don't go the melee route. Rogues don't have the AC or the HP to stand toe to toe, so getting the flank for the sneak attack will get you killed pretty quickly. On the other hand, your presumably high Dex will make you a good candidate for the bow tree.
2) Get the party wizard or sorc to take Glitterdust. Granted, this won't help you against undead, but it will give you many rounds of sneak attacks against more vulnerable foes.
3) Max out Use Magic Device. You can really save the party's bacon if the cleric goes down and you pull out the wand of cure X.
4) Max out Spot and Listen. In my experience, party spotter (or more than one) is a very important role. Not being surprised can make a huge difference in an encounter.
--Axe