Qballfc, welcome to the forum and one of the best hobbies there is. My first detector was the Pioneer 202, and though it is my backup I can honestly say it is still my favorite. Practice, practice, practice, once you understand what it is telling you the fun never stops. The Pioneer 202 is essentially the same as the QuickDraw. A truly great machine. Ok, let's look at your questions. Cleaning coins. There are several ways to clean them up. Some diggers use vinegar, peroxide and salt. Others a tumbler, some olive oil, and still others use an electric process that works good. Do your homework and experiment till you find one you like. A quick word of caution: be very careful with older coins, the patena is what collectors find desirable.
Digging tools. I am not familiar with the "hori hori" but a popular digging tool is a six to eight inch narrow garden trowel sold at Home Depot or Lowes or a good hardware store. Practice pinpointing, this will enable you to dig a smaller and neater hole (plug). When you dig the plug try not tear it all apart, keep it in tact if possible it will help make a neater fill. Try to leave the plug with as little evidence of you being there as possible. With practice you can become very efficient retrieving targets with a screwdriver, it's called "popping coins". A good pin pointer will help locate the target faster and with less digging. A sloppy dig is very bad advertising for the hobby. Another word of caution, most city parks are friendly to detecting, however, some county parks have restrictions. State parks you must make inquiries, most will require a permit or be closed to detecting completely. Federal parks are almost always closed to detecting. Generally beaches are friendly to detecting between the surf and vegetation line.
Beach hunting. In dry sand the 202 will work great. Wet sand is more difficult because of mineralization. You will need to experiment with disc and sensitivity. For beach hunting a sand scoop is a must. You can get a good plastic scoop for about $10 or you can go with aluminum and stainless steel with short or long handles between $35 and $200. I hope you find some of this helpful. I've been detecting about fifteen years and learn something new every time I go out. I'm sure there are others on the forum who can help you out as well. You've got a very reliable machine, spend time with it. I actually nicknamed my 202 "George Washington" because once I learned what it was telling me, it never told a lie. Good luck and Happy Hunting.