I am making a Vampire. Can someone please tell me the best race to begin with also which class and birthsigns to have. Thanks again Guys.

Vampires are not a class. You can make all kinds of vampires - spellcasters/archers/warriors etc. They all get bonuses that are useful to them. Therefore, class and birthsign is just personal preference.

Dark elves are the best race to choose though. As a vampire youll get progressively weaker to fire, so it helps to start off with 75% resistance to fire. Another nice aspect of dark elves is that they can be molded into any class because they're so versatile.

I've never played as a vampire before but I do know a few things about them.
1. Dark Elves make good vampires as their fire resistance will cancel out the fire weakness vampires have.
2. Avoid playing as a High Elf or using the Lord or Apprentice birthsign as they all have a massive fire/magic weakness.
3. The Atronarch birthsign could help you as they have a chance to absorb some of those fire spells.

That's all I know. The http://www.uesp.net/wiki/Oblivion:Vampirism page might help.

Edit: Ninjas...

Firstly, a hearty welcome to the forum! :icecream:
Someone will likely be along to issue you a stick made of fish, but I quite prefer blueberry ice cream.

Now toward your question - well, sort of. My character is a wood elf, but she hates vampires. Some of that is because Azura chose her as a Slayer, but part of it also is because she was almost killed by a vampire once. http://i668.photobucket.com/albums/vv43/Acadian6/Cho%20Bk%201/ScreenShot624.jpg

But of course that doesn't really answer any of your question, so let me meander in that direction. . . . From her point of view - quite understandably I should think - she perhaps fears orc vampires the most. They are big and green and mean and fast and are born with the teeth for it. They have 25% magic resistance. The face of an orc takes cosmetically to vampirism quite well - in fact it probably improves their stunningly beautiful features. Don't get me wrong now; my character actually quite likes orcs - but when they are vampires . . . well, http://i668.photobucket.com/albums/vv43/Acadian6/buffy1.jpg.

Birthsign? Now, well that really brings up what kind of vampire you want. I should think the prudently aspiring bloodsvcker would hope to be born under a sign that enhances their chosen style. A mighty warrior might choose to grab that very birthsign (Warrior), while a sneakster is likely to pickpocket the Thief as a birthsign. Those who dribble, or rather dabble in magic - or even those who are multi-talented or well-rounded souls would be well-advised to consider the Mage. While Atronach can be a superb sign, it is perhaps best reserved for somewhat advanced players - something to consider based upon your experience with the game.
:dance:

If you want to negate the weakness to fire a Breton is just as good as a Dark Elf. That's because all the fire damage in the vanilla game is magic damage so Resist Magic will protect you from it. And if you get 100% Resist Magic you will be immune to it, even if you otherwise have a Weakness to Fire.