If you're not planning to backpack or canoe camp, the size and weight of a tent doesn't matter so long as it fits in your vehicle. Tent capacity is based on the square footage and how many standard sleeping bags will fit in it. For example, a 2-person tent will accommodate just two people. There will be very little elbow room or extra storage space. You'll find a 4-person tent will be more comfortable for two people, and you will have space to spread out and store your gear too. For a family of four I recommend a 6-person tent. As a rule-of-thumb buy a tent that has a capacity rated two people higher than the number that will actually be using it.

You may want to check out the multi-room tents. If you're camping with the kids, a 2-room tent provides a little privacy. Multi-room tents come in 2-room styles, where the rooms are separated by an inside tent wall with a zippered door. There are 3-room styles that are like the 2-room ones but with an added screen room, which is nice for changing wet or dirty clothes before entering the other rooms, and which are great for setting up chairs or a table to use in case it rains. There are also 2-room tents, which have just one large sleeping area and an attached screen room. Tents with screen rooms attached are great for storing gear outside the sleeping area.

from http://camping.about.com/od/campinggear/a/tentbuyingtips.htm

A tent with aluminum poles - Tents may come with fiberglass poles, but they are fragile and more likely to break. If you bend or break a pole, most camping stores sell replacements or repair kits.

A tent with an adequate rain fly - The rain fly is your tent's umbrella. The bigger the better. Look for a fly that comes well down the sides of the tent rather than just across the top. Rain flies are waterproof. Tent walls are water-repellant.

A tent with folded seams and double stitching- If you can pull the material on either side of a seam and see through the stitches, this tent will leak. Be sure to use seam sealer on all seams.

A tent with a one piece tub floor - The floor should be made of waterproof material, and it should come a few inches up the sides before it is sown to the tent walls. No seam in the floor means there is no place for water to seep in.

A tent with adequate guy lines - Tent walls, and sometimes rain flies, have loops sown near the middle. These loops are used to attach guy lines that pull out the walls so that they are taught. It's impossible to sleep in a tent that's flapping in the wind.

A tent with good-sized stake loops - There should be loops at the base of your tent in every corner and at the center of each side. These loops need to be big enough to accommodate the large plastic stakes sold in camping stores. Material stake loops are preferred. Plastic ones might break when you hammer in the stakes.

A tent that uses noseeum meshing - This is the best material for keeping those nasty little bugs out.

A tent with a roof vent - Opening this at night will help create some air circulation and eliminate condensation inside your tent.

A tent with heavy-duty zippers - You'll be in and out of your tent a lot so you want zippers that will hold up to frequent use.

from http://camping.about.com/od/campinggear/a/tentbuyingtips.htm

-As you unpack your gear take inventory. Did you leave anything behind? Identify any items that are damaged or broken; make a list of what needs repair or replacement.

-Separate all clothes and bedding items that may need laundering. Don't wait to start doing the laundry, wash whatever you can as soon as you can to remove outdoor smells that can come from campfires, or from lakes, streams, and beaches, or from dirt, mud, and sand, etc.

-Be sure to air out any camping gear which may have gotten wet on the trip to avoid possible mold and mildew.

-It's a good idea to store your self-inflating pads and sleeping bags loose rather than in their stuff bags so that they maintain their loft.

-Clean all kitchen utensils, cookware, dishes, glasses, and silverware. Return kitchen items to where they belong and store all camping specific cooking items together. To help keep these items organized, consider using a chuck box.

-Return any leftover foods to the refrigerator or the pantry, as necessary, and discard any foods that may have spoiled. You'll know which ones. Just let your nose be the judge.

-Make sure that any camping stoves and lanterns and turned off and that all fuel containers are properly stored.

Take good care of your camping gear, and it will reward you for many years to come. By using an after-camping checklist when you return from each trip you'll always be ready for the next.

From http://camping.about.com/od/campinggearchecklists/a/aftercamping01.htm