Welcome to Gaia! ::

This system is one I first roleplayed with in college. It is a d6 rolling system that uses a concept known as overthrow. Basically match a number then anything over will add to damage or skills.
B.A.M.S. stands for Body, Appearence(which is an optional stat), Mind, and Soul. These will represent your stat block and each can have a value of 1-10. A zero in any means you are dead and a 1 is the lowest form of that stat(as if a mind of 1 would make you a child of ages 1month to 4 years old). 5 is an average stat. Now if you have a 10 in a stat, you are considered an almost super human for that stat. Monsters that the players face will be able to higher stats than that but humans are restricted(but there are special cases but that is up to the gm). Also, each stat contributes a number of + or - to your skills and feats. 10 = + 5 and a 1 = -5 will a 5 = 0.
All characters follow a level based system that usually has the players begin at one but their is no limit on levels a player could have. Leveling up will give you points to spend on your skills and feats(which techniquely are the same thing). The number of points those players gain per level is determined by the gm. This system is flexible in that the dm sets all these values.
Skills are chosen by the players using another point system as well as another level based system. I will use an example character to show what I mean.

Name: Renn
Level: 1
Body:5
Mind: 5
Soul: 5
Appearence: 5
Skills and Feats:
Tackle Level 1
Gun Proficency Level 4
Armor Proficency Level 2
Magick User Level 1
Understand Ancient Languages Level 2

I used a 16 point buy for the stats and a 10 point buy for the skills. Now the skills can further be augmented by using flaw points. These are bonus points you gain from taking something that will be detremental to the character.

Example: Fear(cats) Level 5 would give the player an additional 5 skill points but that character would suffer a -5 on all rolls when dealing with all cats. But if he would put that into his magick user skill he would have a level 6. Which in this case would mean he could cast more spells and could do more damage.

Hit points exist in this game as well as an Armor Class. Hit points are derived from the characters body and soul stats. It's up to the dm to determine how they affect hp but a more common method is body + soul x 2 because a roll of a 6 on damage dice can be very painful. Hp will go up in level, but it will only be body and soul added together or any other way the gm decides. Armor class is determined by body and any type of armor you are wearing or any skills that you have that could modify ac has well. So my character above would have an Ac of 0(because it will use the modifier) until he used his armor proficiency to put on a flak jacket. That would raise his ac by 4(Ac bonus for armors are determined by dm as well).

Now for the part for rolling. As stated above, it is a d6 system. Basically how this works is you take your skill, for example I will use takle, and roll a dice equal to the level that the ability. Since takle is level 1, I get one die 6 to roll against the enemies AC. Now after the player has rolled his dice, he can add any ability modifier that would work for the situation. A tackle is a body type of attack so adding the ability modifier for body, which is 0, to the roll of 5 means he can hit armor class 5 or anything less. The monsters AC was 3 so this is were overthrow comes in, Since two of the characters points were unblocked, the creature will take it as damage on top of the weapons normal damage(be it a gun or sword).

OK so it seems like a lot but it's actually easier than it looks. I will give you a full combat example. Here is the character and he is facing a zombie.

Name: Thom
Level: 2
Body: 8 + 3
Mind: 2 - 3
Soul: 9 + 4
Appearence: 1 - 4
Hp: 41
AC: 9
Skills:
Sword Proficiency LvL 6
Sword Thrower LvL 2
Armor Proficiency LvL 4
Dodge LvL 5
Government Contacts LvL 3
Flaws:
Allergic to Mold LvL 5

As Thom rounds the corner of the old catacombs below Notre Dame, a horrid smell of rot and decay asails his nostrels.(Since this would be caused by mold, the character would take a -5 when dealing with the zombie.) About 5 feet in front of him, he can't believe his eyes, is the body of a spectator from above. But it seems to have been down here for ages. How could this be? Well as Thom moves up to pass it up, the body begins to move. Thom's first reaction is to swing his sword at it. He rolls 6d6 against the creatures AC. He rolls 1,1,1,2,4,and 3 for a total of 12. The monster has only a AC of 0 because it can barely move. So the sword slashes as it would any normal person. He then rolls up damage for the sword, he is using a longsword so it does 1d6 + 2 + 3(Body Modifier) + 12 for the overthrow. He rolls a 6 on the damage for a total of 23 damage. That could take out just about any normal foe, but the Zombie seems unaffected by most of the damage. Since the creature is slow it gives Thom another attack before it can actually attack.

Combat can continue like that for rounds.
Even though it seems like a lot, after a few moments in a normal game, a player will pick up on it. It's fast and fun and allows for a good rp experience.
Let me know what you think and ask any questions you feel necessary to ask, I will gladly answer.