If i make cheerleading will i be a base or a flyer?

Okay I'm trying for cheer this year because all my friends are cheerleaders and they begged me lol. :) Cheer is fun but I don't think I'm very good but my mom is paying for lessons. I'm 5'3 and 109 lbs and now I'm going to stop drinking soda and so I may drop a pound or 2 and the cheerleading lessons may make me lose a couple pounds too. The other flyers for the 7th grade are my friends jordan richie courtney and virginia. Courtney is like a skeleton and its kinda gross lol she's like 70lbs and is my height. Richie is my height and is really pretty she is skinny but not like a skeleton she looks like she weighs 90-95lbs but she's maybe an inch taller than me. Jordan is little like courtney but is shorter and I think she's around 80. Virginia is 85lbs and she is like 4'9" and I'm skinnier than the rest of the 7th grade cheerleaders. The only girl other than the flyers that is skinnier than me is sierra and she's 102lbs and she's 5'5" so she has to be a backspot because she's tall and I'm not tall enough. So I'm either gunna be a base or a flyer. I'm scared to be a flyer but it'd be cool lol. I just want to know what my chances are because if I might be a flyer I need to practice my balance. All the other bases and backspots are bigger than me. And do you cheerleaders have any tips on how to make the squad? And getting jumps higher? And please give links if you can to the different jumps because all I know is toe touch and pike jump and I need to improve them but idk what herkies and stuff are.? And to the arm movements.? I only know high V low V Right and left L and daggers (sp?) And when people say be "sharp" what does that mean? SORRY GUYS THIS IS SO LONG 0AND SORRY FOR ANY MISSPELLINGS BECAUSE IM ON MY PHONE. Thanks!! :) :):)