Sosage, the secret to success in anything is determination and not giving up. I hear what you are saying, when I started fossicking 25 odd years ago I was filled with visions of untold wealth leaping out of the ground at me. The reality was me finding pyrites and learning the hard way that finding treasure is hard work and that knowledge and experience is more important than having all the fancy gear.
You have got a good machine in the ACE350. I can only suggest what everyone is saying and that is practice and time. Learn your machine and dig every target. Find a few parks or beaches and just keep going over them and dig every target till you understand what the machine is telling you is under the coil. Getting someone to 'teach' you is helpful but it isn't going to give you the knowledge that comes with experience.
When you start finding worthwhile stuff it will vindicate all the crap targets you have dug. However you should remember that you are going to dig a lot of crap even after you are experienced.
I guess that it doesn't help to read of all the finds other members have on this forum, but remember that we all dig ebough trash to open our own collective recycling yard!