Ok.
Time for big tips.
1. Own paysite - good if design is ok at least. New paysites for a month or so will convert like heaven.
2. Money for content is bullshit in comparison what You will need to promote Your partnership programm.
3. The convertion of trial to month membership depends a fucking lot on price of trial and month membership. If You trial is extremely cheap (i.e. 1.95, 2.95) You will get 90% of trials or so and almost no month memberships , neither trials to month or month straight away memberships. That is if Your content is not exceptionally good. If it is that good , i.e. You can really compete with main sites (take any of Your competitors) than make a trial as cheap as possible.
If however You cant compete really, than make trial expensive (7$ for example) and month membership not so expensive (30$ for example, 24.99 for example).
The fact of the trial membership existance on Your site will make surfer beleive that You are quite serious. The fact that it's expensive will lead them to beleive that Your site is very good. The fact that month membership is on other hand NOT so expensive will convince some of them to go right to the month membership without loosing money on trials.
However if Your content with such technologies used will be WORSE than average or simply too average You are putting Yourself in a great risk of chargebacks.
And remember. This is real a tip. It is contrary and different to what most will say and most books will teach You. However if You do what most people do You'll earn exactly the same amount of money most people do..