There are a lot of good sprites on the internet (Our own gallery has quite a few). This includes tilesets, sprite-sets, backgrounds, and all that other good stuff.
We also have a large selection of scripts, and so does the rest of the WWW, so you may want to look around. What exactly are you looking for?
If this is your first project, then postpone it. Your first project should be a small game used to test your RMXP skill on. If you need RMXP eventing and mapping help, there are some tutorials for those as well. (I'm working on a huge RMXP tutorial, but it won't be finished for a while).
I suggest that you start making a small practice game, and whenever you need help with it, just post. You don't need to use custom graphics in a practice game. ;)
If this is not your first project, then you should post more details and this should be in the RMXP WIPs section.
I hope this helps! If there is anything you need specific help on, just ask.
Note: This is in the wrong forum. When you need help, post in the general support forum; please be ask more elaborate questions next time. We don't know what kind of scripts and character sets you are looking for. You'll need to specify. ;)
Here are a few notable sites to check out:
-Learn the basics of RMXP-
-RMXP Unlimited's Resources-
-RMXP Unlimited's Script Archive-
There are a lot more scripts around the net. Just ask google.
-Sithjester's RMXP Resources-