Moped Army

Hello Army~

I recently purchased my very first moped. It is a 1985 Sachs G3. I know very little about mopeds, but I am eager to learn. I've ridden it some, and here are my concerns:

1) I get a lot of speed on flat ground, and can make it up hills with a running start, but if I have to start on a hill... I'm screwed.

2) Rear coaster brake seems to be jerry-rigged on. Not sure if has anything to do with the 70cc kit that the previous owner put on. How should the brake be attached properly?

3) Bike needs to be pushed usually to get the engine to kick. Shouldn't I be able to pedal start this?

4) Stalls out sometimes when I have to slow down/stop (in intersections usually).

Please give me some advice.

Thanks!