Online database help

Well, I would like to make a site just for keeping a database(derby probably) with passwords and names.

So, I would like to ask you
1)if it is possibly and if so is it easy?
2)What i would need to buy and make fro the site
3)is it cheap(total cost)?
4)What I would need to check if a password is in the database?

Thanks in advance,
Souperk

This is a pretty vague question, so you probably aren't going to get a very exact answer.

1- It's possible. And how easy it is depends on your definition of easy.
2- Initially, nothing. Get it working on your local machine, then worry about putting it online later.
3- Again, depends what you mean by cheap, and it depends what exactly you want.
4- It depends how you store it in the database in the first place. And it depends on what exactly you're asking- how to get the password in the first place? How to retrieve something form the database? How to properly store passwords (don't)?

Well, I have made a bot(with mouse controlling) and I am thinking of selling

1)Well I have been learning java for 7-8 to months alone java. I don't know any other languages(programming) except from a little sql
3) about 50 euros maximum
4)I am thinking of having 2 variable (one for username and one for password). But, am not concerned for the database I worry about loading from online due i haven't work with anything online yet. Are there any differences between loading information from your machine and from online

Thanks in advance,
Souperk

What does the bot do?

It is for a browser game i used to play 3 - 4 years ago. It simple moves the mouse throw some locations on the screen(x,y) and then clicks. The locations are my defaults that works on my screen and also you can enter them manually. Also I will update as soon I will find anything to add because I don't remember the game now.
I need the online database because I will upload it free for a start and if I see that people use it I will make it with charge. If so i will use the database for that reason.
For now I only search it to see if it is worth the trouble.