I've never done aggressive but always wanted to ... it takes a lot more ummmm, ahhhh, cajones than I have. Balance wouldn't be your problem. Neither I assume would wearing the proper safety gear ... helmets especially and wrist protection as well.
You're next step would be to get some inline skates. There are so many different brands out there (K2, Rollerblade, Bont, Roces, and on & on) and many different kinds within the brand. I'd suggest you go to a sports store that sells skates and try on as many as possible. Stand in them, skate in them in the store and don't buy them if they don't feel right. Fit is extremely important when it comes to skating. You don't want to buy the wrong size skates, too tight and your feet and skating will suffer, too large and you'll not have proper control and your skating will suffer. And wearing 2 pairs of socks does not work. PM me if you want more details.