So the proper foot placement for the ollie is with the ball of your back foot horizontal on the tail of your skateboard.  And your front foot centered on your board right behind the front trucks.  You may find that moving your feet around in different positions are more comfortable.  This is fine,  everybody can learn how to skateboard their own way.
The wheels of a skateboard are usually made of polyurethane, and come in many different sizes and shapes to suit different types of skating. Larger diameters (55–85 mm) roll faster, and move more easily over cracks in pavement and are better for transition skateboarding. Smaller diameters (48–54 mm) keep the board closer to the ground, require less force to accelerate and produce a lower center of gravity which allows for a better response time, but also make for a slower top speed and are better for street skateboarding. Wheels also are available in a variety of hardnesses usually measured on the Shore durometer "A" scale. Again like car tires, wheels range from the very soft (about Shore A 75) to the very hard (about Shore A 101). As the A scale stops at 100, any wheels labeled 101A or higher are harder, but do not use the appropriate durometer scale. Some wheel manufacturers now use the "B" or "D" scales, which have a larger and more accurate range of hardness. Modern street skaters prefer medium-sized wheels (usually 51–54 mm), as small wheels with lighter trucks can make tricks like kickflips and other flip tricks easier by keeping the center of gravity of the skateboard closer to the deck, thus making the deck easier to spin. Street wheels are harder (A 100/A 101). Vertical ramp or "vert" skating requires larger wheels (usually 55–65 mm), as it involves higher speeds. Vert wheels are also usually slightly softer (A 98/ A 99), allowing them to maintain high speed on ramps without sliding. Slalom skating requires even larger wheels (60–75 mm) to sustain the highest speeds possible. They also need to be soft and have better grip to make the tight and frequent turns in slalom racing. Even larger wheels are used in longboarding and downhill skateboarding. Sizes range from 65 mm to 100 mm. These extreme sizes of wheels almost always have cores of hard plastic that can be made thinner and lighter than a solid polyurethane wheel. They are often used by skateboard videographers as well, as the large soft wheels allow for smooth and easy movement over any terrain.
Shock pads are made of polyurethane and rubber. They are very similar to risers but vary in the fact that their sole purpose is to cushion the board from the trucks. Since the trucks are metal and the board wood, whenever the board hits the ground after doing a trick, the energy goes through the truck to the board ─ this has caused boards to crack, split, or even break in half, and shock pads were created to prevent this.
The DreadXBoards Concave Skateboard has Plastic Deck Injection Molded for excellent durability. It features Urethane Wheels 59mm 78a, aluminum trucks, and Abec 7 Bearings. It is completely assembled and is ready to ride. It is perfect for beginners or experienced riders. It can load up to 185 lbs. It is great for kids and adults. It has an excellent rating of 4 on Amazon.
In 1977, skate parks began cropping up all over the place, including Skateboard USA, where Gelfand began to spend most of his time. His buddy, Scott Goodman, is the one who gave Gelfand the nickname of “Ollie” and dubbed his aerial lipside the “ollie-pop.” Pictures of Gelfand during this time period clearly show him getting airborne and performing the trick associated with his name today.
So now that you have an idea of what size and shape board you like, it’s time to choose a brand. A popular size is an 8.5 skateboard deck. If you were looking for a size 8.5 skateboard deck, you could narrow the decks offered on to fit in the 8.25 - 8.5 range. This will show you all the boards in that range, and significantly reduce the boards you have to look through. Now, if you don’t have a preference on board brands, find a graphic you like and you’re all set. If this is your first skateboard or are still learning about what wood and brands you prefer, we recommend checking out a CCS Skateboard. They give you a bang for your buck, that's for sure.
Ohderii Skate Skateboards are made of a High-quality Plastic deck which will not easily break even when pressed over by a car.  It comes with 3.125″ all aluminum alloy trucks, 59mm 78A super smooth PU wheels and ABEC-7 stainless steel bearings.  It is ready to use and you can easily store it in your backpack.  It has an average rating of 4.5 on Amazon.