Hi :) I started on february, so one month before you and I am silver 3 now.
I think you have the basic kwnoledge about the game, so I'll just remind you a few things:
1.Be positive. Never flame, never say bad things. If you don't have a good thing to say, then don't say anything.
2.Try to be friendly with others, because it will create a sinergy between you and the rest of the team and you'll get better results.
3.In lane, focus on farm, try to be always above your enemy when it comes about gold.
4.Always upgrade your trinket as soon as you hit level 9. The vision means power.
5.In bronze/silver play easy champions like Annie, Garen. You can carry very easy.
6.If you think you don't know something very good, then go and google it.(Example:good ward locations/objectives/items)
7.Watch guides. Just simply type "tips for bronze/silver" and there you go.
8.If you can record your games then it's awesome :D because you can watch and see what you did wrong...and remember to don't do it again.
9.Try to have fun. If somebody flames at you, don't go on tilt. Just mute them or reply with something funny.
10.Learn to adapt your build. Don't go with the same build in all games. And practice with a new champion in a co-op game before you go in normals/ranked games.
Those are my tips :) I didn't played very much, but I think some of the things I wrote will help you.