Hi Tyrone, and welcome to WriteWords.
Yes, nothing beats reading one's work out loud for weedling out those typos. I'm looking forward to the end of the school hols so I can get back to it - at the moment I'm relegated to muttering under my breath
As for when to send it out to the Agents, Jo's advice is very sound, wait until it's finished and polished, not least because the Agent will want a synopsis complete with the ending and the character developemnt all laid out, and it's difficult to do that when it's not finished.
Any questions, just ask.
- NaomiM