I have a few things to add about the water in the pump....
Using hot water is a good idea to re-seal the pump if it has dried out, as cold water may leak out via the impeller shaft. This may not work if the pump was already leaking, or it may not be necessary at all, but it is a very good idea. Warm or hot wash water may also eventually seal a leaky pump, if it is leaking simply due to an extended period of dis-use.
I would advise however that you put the water in the tub outlet, which feeds the pump, basically what Kevin said. If the machine has a manifold trap, which it probably does, you'll need a couple quarts to properly douse the pump, but the manifold once full (16 oz. I'd estimate) will drain directly into the pump without interference. Using the drain hose however may or may not directly reach the pump. Some models drain through a self-cleaning lint filter, which is mounted either in the corner of the cabinet or on the side of the tub (depending on age). Cabinet mounted filters drain upwards at the top of the cabinet, so you'd have to fill the filter and fill all those hoses before you reach the pump. Some models from the early 70s forward use a pump that will NOT gravity drain in the agitate settings and won't allow water in from the backwards direction. Washers with a cabinet mounted self cleaning lint filter don't gravity drain either unless a siphon can be created. The tub-mounted filter (possibly too new for your machine) would have similar issues getting water backwards to the pump.
To avoid determining which configuration you have, I'd just pour the water into the front left corner of the tub, which is where the outlet and manifold are. All models will drain from there into the pump.
Dislodging the belt if it has become stuck or adhered to the pulley(s) is a good idea too. I haven't seen many badly stuck belts from machines that were unused only for a few years unless they were exposed to a lot of moisture such as a damp basement or outdoor weather, which allows pulleys to rust and rubber to rot.
Once that's good to go, I always set a machine to a drain/spin portion, with the lid up so it won't spin, then just let it idle. Next, engage spin. If the machine will dry agitate in the normal cycle, that's a very good pre-water check (some won't but if they do it's in the last 2 minutes of wash). If the machine idles, spins and agitates, then go for it!
Gordon