For those new to this means of expression, you may need a little help, and there's a great deal of it on-line. Check out one or more of the ones below.
The writing profession is an honorable one, but there are always folks out there ready and willing to rip off new writers. To protect yourself and make better judgements regarding agents and publishers, go here and spend some time.
Of course, you may find other forums on writing craft, but one that's both competent and lively is writers.net/forum. Drop by and lurk for a while. Just don't be a troll.
Okay, your manuscript is done and you'ved edited it over and over, polishing it to a glossy sheen. Now you're ready to query an agent, hoping for representation. But first, find out how to do it right, else rejections will surely come your way that do not fairly reflect your actual work. Try these:
Want more? Well, there exists help all over the web. One place to start might be;
A lot of good stuff there, including many additional references at the end. So, curl up, click, and read. And good luck.