Protips
1. Armor Up
-As a 1h cav player, you will be in the shit, fighting with your infantry in crowded melee combat. You need to armor your horse, and yourself. Many a time I have entered the fray, only to get my feet cut up and die. Armor yourself, and don't skimp on your feet! Once you have the money armor up whenever possible, for your ass-kickery will be vastly improved.
2. Pick a good horsie.
-For grinding purposes I would suggest a rouncey. Once you have the money, upgrade to a destrier and use that as your primary mount, switching back to the rouncey if you're low on cash, or if you're bored. Eventually get one of the metal horses (cataphract works well).
3. Thrust is your friend
-The thrust attack is extremely effective against any target, particularly enemy cavalry. It's kind of like being a lancer, actually. I might point out that it deals piercing rather than cutting damage for most weapons, which, combined with your speed bonus, makes it a good anti-tincan attack.
4. Pad your k/d
-Your job, as cavalry, is to be a kill whoring bundle of sticks. Steal teammate's kills. Go for the AFK's shamelessly. Kill the stragglers and peasants. Go for distracted archers. Bump those 1h/shield users into the ground. Actually, bump everybody into the ground.
5. PS helps
-Get a build with good powerstrike. I occasionally play as 1h/cav using my lancer build (I was dedicated 1h/cav last gen), but when I do so my performance is meh because I hit like a girl. 15/21 build isn't a good idea for the fledgling 1h/cav.