RJT
Don't get discouraged, like SmokinJ said, there is a definite learning curve.
One thing, keep notes on what you do, type and size of meat, cooking temp., meat temp., time, wood type, wood quantity, etc. That way you can avoid repeating mistakes and learn from them and if you like a result, you can repeat. Also, if you ask the forum and provide those details, we are better able to make suggestions. Your post did not state what you did not like about your results, i.e. too smoky, too tough, over/under done. Read SmokinOkie's 101 tutorials listed above under SmokinOkie's guides. They will give you a lot of info and how to advice.
As to your 1st smoke - top round to 143 deg. First, IMO a top round probably is not suitable for a smoke because it is a very lean cut of meat and 143 deg. is probably over done. If you really like top round and want the smoke flavor, try starting in the smoker at about 200 deg on thermostat for about 1 to 1.5 hours then remove to indoor oven and finish under a high heat.
On the chicken, next time try a higher rack position and remove when you reach an internal temp of 175 deg. internal temp on the thigh. Was the chicken you used a roaster or fryer? Fryers are younger and smaller, but also more tender. You might also consider brining your chicken before smoking.
Unless you prefer a heavy smoke flavor, try cutting back on your wood quantity. That is a personal taste issue, but too much wood will result in some bitter taste.
Don't give up. Like SmokinJ suggested, try a pork butt. The butt is one of the most forgiving meats to smoke and has the added benefit of significantly improving the seasoning of the interior of your smoker, not to mention one of the most satisfying in terms of the finished product. Do read Smokin's 101 on pork butt.
Keep trying and good luck.