Oh, why didn't you just say so...lol. And no the 700 basic manual cannot be used for the 300 they are way different. Ok, first off to check the oil there is a sight glass right behind the front of the right rear tire. Make sure you are on as level ground as possible then look into the sight glass. There should be two sets of lines on either side of the glass, one top set of lines and a lower set of lines. Your oil level should be no higher then the top set of lines and no lower then the bottom set of lines, so right between both set of lines is what you want. The oil filter is located to the left of the sight glass, it's behind the cover with the 3 small nuts. Here's a pic:
Oh ya, the drain plug for the engine oil is located under the bike right between the rear tires, it's slightly closer to the right side though. (The bigger bolt) Here's a pic of the drain plug:
And the fill plug is at the rear of the bike to the right again. For this your gonna want to use an motorcycle oil with a viscosity of at least 10W40. If your ambient temperature drops bellow -0 i would advise to use a sae 5W30 oil instead. This will ensure easy starts and smooth running when the temperatures reaches below -0. Once again try and use a motorcycle oil, this is because the motorcycle oil has a wet clutch additive to it. Here's a pic of the fill plug:
Checking the differential oil is a tad different. It is located at the front of the bike under the front portion of the skid plate. So for this you'll need to remove the front portion of the skid plate ( 4 bolts i believe), after you've removed the skid plate remove the top filler plug for the differential oil and check the level. You should see the level of the differential oil right at the bottom of the fill hole. And for this use a sae 90 Hypoid gear oil. And sorry i don't have a pic for this.
For a spark plug, use NGK DR7EA, and if you bike tends to run hot you can use NGK DR8EA as well. But use this plug only if you think your running hot. If you need further assistance on changing the oil let me know and i can run you through the process of doing so. Hope this helps.