not much control

ok , so i havent been really working on LDing for a long time because of studying but i get one every once in a while and up till now i think i got about 10 or something , at first i had problems keeping in the dream after becoming lucid but now i can become lucid for a really long time but without much control , so last night for example i had that very long dream where i woke up , dressed , and went somewhere strange where all my school friends were , then i did a reality check as some joke with another friend who lucid dreams and i found out i was in a dream , then suddenly i was at home again but still lucid , so i walked around a little then tried to use the PC as many people said electronics dont work well in LDs and i wanted to try it myself and for pressing on anything , it gave me the same weird error "cannot load package" or something , then i walked around a little then i thought about going out of the house (which is VERY hard to do while LDing and i dont know why) , and i was goin to wake up but i managed to go out , and walked a little then i flied (which is pretty easy to do for me) until my adrenaline rose and i woke up
so this was pretty long given the time i spent walking around and the things i cant remember right now , but i have problems in things like summoning people or changing the scenery and telekinesis and things like this
what should i do to be better at them ?

Although some are naturally good at it, most people have a hard time with dream control in they're first LD's.
First thing you should do when you enter a dream is to stabilize it, check this tutorial for more information about that.
When it comes to dream control, and lucid dreaming in general, one of the most important things is confidence. You must believe in you. In a dream, the only limits are only your imagination, so if you believe you can do something, you will do it!
Other than that, just keep practicing. Practice makes perfect.
You should also take a look at this tutorial on dream control.