See, there is this girl at my school that i like, and i would like some advice on maybe asking her out without looking too creepy or seem like a perv-ish person, i know already that you need to know a girl/guy before asking her/him out and i've talked to her a couple of times, can any of you guys give me advice, please? 

Hang on... Are you asking US for dating advice? You do realize that is probably the worst mistake you've ever made?

You could start with a group/double date before a 1 on 1 date so it won't be weird. But that's my opinion. But ummm you could ask if she would want to hand out at the park after school for a little bit.

i say wait a bit longer (like a few weeks) and just try to talk casually with her whenever you get the chance (but not to the point when you get annoying) and then if you see that she is just dong nothing, just say "hi, [put name here] would you like to do something sometime? i like you!" dont try to sound cool tho. a bit of blushing is ok. although ive never had a girlfriend, this is how i would tell a girl i like. i hope you 2 will be happy together!

Does she likes the same stuff you do? You can get a full conversation with that

It all depends:

How well do you know her?

Did you find out anything you two have in common?

How friendly are you both?

Dose she seem like the person who would find your appealng?

Where would you take her if she accepted?

How do you think it will work?

Consider these questions before ever asking out anyone? This reminds me of the time I gave dating advice to other people long ago. Good times.

You could start with a group/double date before a 1 on 1 date so it won't be weird. But that's my opinion. But ummm you could ask if she would want to hand out at the park after school for a little bit.

What type of group date?

What type of group date?

Like ask a few friends to go with you and her ....Like a group of friends go to the movies or out to eat. IMO it could eliminate awkward silences. But with people you both know.

Get her number and start talking outside of school. And I completely agree with what Xora98 said, a group "date" is a good way to start things. When you know the girl a little better then ask her out, and don't feel bad if she says no. (Not implying she will, but you never know.)