The other thing I learned very quickly, is that you want to keep what ever shot you hit to them low. If I can hit it crisply into the corner or angle it off it doesn't matter they aren't going to get it. But, if I can't do that at least hit a ball that stays low and will be at their feet. If I hit something that sits up at all the points over and I lose.
From what I'm gathering in your posts, it sounds like you're well on your way toward S&V proficiency. I grew up playing on grass courts, so I was playing S&V all summer as a kid. I used to do it exclusively, but now when I play on hard courts, it's often practical for me to play more points starting from the back court with a baseline rally. But I'm always looking for that short ball that I can attack and I also S&V once or twice per service game.
This instinct you're finding for keeping the ball low is solid gold for this style of play. Leave the ball up in a baseline sniper's strike zone and that sort of opponent will have much better looks at passing shots. The slice is sometimes "poo-poo'ed" as an old-school relic, but if we hit it correctly it skids low, stays under a big hitter's strike zone, and it also flies more slowly to the far end of the court, so it gives us time for an extra step forward.
A slice approach generally turns tragic when the attacker hits a slice with improper technique or is simply not patient. When we make contact too far out ahead of us (toward the net), the racquet face will tend to open up, slide under the ball, and pop up a floating slice instead of driving it and producing that nice low skidder. It's important to understand this key transition shot - it will make S&V life wonderful for you if your slice is decent.
The other low shot to keep in mind is the semi short sort of "soft slice" that also skids and stays low, but lands shorter in the court and forces an opponent to almost lunge forward and scoop the ball up - it forces the other guy to hit what I like to call a snow-shovel shot. Impossible for the opponent to drive a ball from there, but the only trouble they might make is to hit a decent lob off their shoelaces. Not entirely routine for attacking the net in a singles setting, but this shot can be lots of trouble when playing doubles.
I'll echo the sentiment that some of our pals already offered above. When you're going to attack the net, that decision happens before you hit the ball that you follow forward. That means that you're going in immediately behind your serve or after hitting a short ball where your forward momentum carries you through the shot (with footwork including the carioca step). As you go to the net more and more, you'll develop the instincts for what to do and when to do it.
There's no one set formula to this style of play. One key to effective S&V play is to think like a baseball pitcher and be unpredictable. That could mean occasionally staying back after a first serve, but then following a second serve to the net. Even managing your serving like a baseball pitcher might keep a returner guessing more often and that can force some weak returns that you can jump on, too.
One general guideline that is rather close to pure gospel is worth noting - more for attacking a short ball than when following a serve to the net. When you hit an approach shot off a short ball and follow that shot to the net, it's smart to hit your approach shot straight ahead or down-the-line and NOT cross-court. That keeps at least part of the court closed off to your opponent as you cross no man's land.
If we approach behind an angled shot, that gives the opponent a chance at a down-the-line pass and sometimes even the opportunity to hit a passing shot at an angle back behind us. Cracking open the court with a wide serve is a little different when using a S&V attack, but remember that it's good to put an opponent in a box so that we can then volley toward daylight.