From my experience, most "Sugar Daddies" online were looking for a relationship with no allowance, wanted too much for too little (spend the whole day with you for $100? Ok, I'm that desperate), were overly sleazy perverts, etc.
First off, get off AM/AF. Those sites are crap. At least go on SeekingArrangement or SugarDaddie. AM especially is penis picture central and you will most likely not find a sexy co-ed in a sea full of bored middle-aged housewives.
Second, when you speak to a girl, be charming and not creepy. A big peeve for me were guys talking about themselves nonstop and what they want to do sexually. Hey I just met you, but this is crazy, but you talking about your penis nonstop is really creepy, so stop it maybe~ Let things progress at least somewhat where the girl isn't sketched out.
Third, prove yourself. Guys that talk the talk but are full of shit is a common occurrence on sugar daddy sites. The last sugar daddy date I was on the guy promised to "spoil me" and a 3k-5k allowance, so I showed up in Louboutins, a sexy dress, and a LV bag. In short, he wanted me to spend the whole day with him for $300 or "maybe more, like $500ish", spend the night, and was kinda pushy about it. Ugh.
In short, if you want a 10 that looks like Kate Upton, be prepared to pay for that 10. Most really hot sugar babies won't accept anything unless it's at least $3k/monthly.
Anywho, sorry for the ramble, I woke up way too early. Feel free to message me if you have any other questions.