Werner paddles has a nice tool on their website to estimate the ideal paddle length. As a new paddler, you will most likely paddle in a "low angle" style (more relaxed approach which requires a longer paddle length).
Aluminum paddles will run you around $50, but if you go up to $120, you can get a carbon-fiber paddle such as the Aqua-Bound Stingray. Even if you don't notice the difference immediately, you will over time, so it would be a savings in the long run to start with a decent CF paddle.
Without knowing the width of your kayak, it is really hard to say for sure, but you would probably be happy with a 220 cm kayak. Look for a retailer that will let you test paddle before you buy. If you live near other paddlers, they might have a collection to let you try a few different lengths. Somehow passionate kayaking starts to lead to collections.
Rescue / Throw Bags
YakCatcher Rod Holder
Classic Freestanding Rack
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