People don't farm well at low elos. If you refine your CSing to be consistently really good (at least 75@10min, ideally 85@10min), you will be going into every game with a massive gold advantage, which will help you win lane and carry since you will be stronger than everyone else. Remember that a kill (300gold) is only equal to about 13 cs.
People are always fighting at this elo. Unless you are simultaneously split pushing towers at the time your team is fighting somewhere else and you think you can get multiple towers or even an inhib and you wont lose the game if your team loses the teamfight, it is almost always best to be aware of everything your team is doing and if they are fighting, even if it seems like a bad fight or engage or there is seemingly no reason why they are fighting, which there actually isn't a lot of the time, it is best to be there fighting with them. You never want to be that guy who is trying to defend a inhibitor turret solo against four players of the enemy team because he didn't show up to a team fight on time that happened 20 seconds earlier.
If you win the teamfight, your team gets a bunch of gold and and opportunity at neutral objectives or enemy structures.
If you lose the team fight, THE ENEMY TEAM gets a bunch of gold and an opportunity at neutral objectives or YOUR structures.
You ever watch LCS and notice that whenever ANYONE starts a fight EVERYONE else shows up within seconds? This is good to do. If you see fighting happening or better yet, if you suspect fighting IS ABOUT to happen, then stop whatever you are doing and go there. You are always stronger together. And this also raises morale for your team, which is surprisingly important especially at low elo.
I play mid a lot. minion wave management is really important. pushing a wave into your enemy's tower will make it bounce back and by this I mean that if left alone the enemy minion wave will push itself into your tower in about a minute and a half; and the cycle will repeat. use this minute and a half to recall and end up back in lane BEFORE the big enemy minion wave goes under your tower to get that CS. If you catch it right, you can FREEZE the minion wave. By freeze I mean you can make the allied and enemy minion wave meet at a location in the lane that is close to your tower but not actually under it so you can farm in a position that is safe from enemy aggression from your enemy laner and the enemy Jungler.
If your enemy laner tries to freeze a lane against you, DO NOT HESITATE! Do one of two things: roam immediately OR use your wave clear abilities to make the minion wave crash into turret which will make it bounce back to your side or the lane; you may want to recall and buy items after doing either of these things. This goes for all players INCLUDING YOUR ENEMY! So be very aware when freezing a lane against your opponent as THEY MAY TRY TO ROAM. NEVER freeze a lane against champions that love to roam (LB Katarina talon zed etc); this can lose you an entire game and it will certainly drastically lower the morale and effectiveness of you team.