You can find lots of very, very useful information on the wiki at
http://te4.org/wiki/Tales_of_Maj%27Eyal_Wiki, including some basic class guides (though many are outdated). You'll find plenty of threads similar to yours here in the forums that will offer more advice than I.
My suggestion, as someone who's played the game a lot (but never actually finished it

) is to start with Bulwark, Archer, Alchemist or (if you bought the expansion) Doombringer. These are fairly straightforward and perfectly capable of finishing the game on normal.
A few simple tips:
Doors (and chests and graves, etc) sometimes require an extra click to open for a reason. That reason is often a very powerful enemy who will wipe the floor with you.
Status ailments are more likely to cause your death than pure damage (though that can happen, too). Have ways to clear them from your character. Early game that's typically Stuns, which are a Physical effect.
You can (and likely should) clear all of the T1 dungeons on the mainland (excluding the Dwarf and Undead starting areas, which are only accessible with said races). You should google a map to find out where these are.
You can examine enemy stats and talents by right-clicking them. Until you have a grasp of what these do that may not help much, but it can be very useful in determining if you can safely take on said enemy and what the best way to do so might be.
Vision and escapes are the most powerful tools in the game, used in conjunction with an acknowledgment that there is no shame in tucking tail and RUNNING FOR YOUR LIFE.
You can respec a handful of your most recent class and generic talents (grouped separately) while in a town. This gives you some freedom in playing with your talents.
Above all have fun!