Videotaping for home studio setups

Okay so first of all, i'm thinking of doing high def videos for my youtube parody-ish covers(music video style)

So I havnt tried using my dslr (nikon d5000) since i don't have a tripod yet(i only use my webcam and phone's cam LOL). I have my nikkor starter lens(15mm-55mm) and a semi long range lens(55-200mm) for a good dof. And my flash is pretty old school. I don't have much intel on such studio setups stuff, all i know is i need a tripod, camera, backdrop, and those lighting boxes stuff(forgot what its called)

I'm thinking of buying Nikkor 55mm 1.8 portrait lens, i feel itll give me a really good soft focus since it has a very low aperture, plus its cheap. Do you think its worth it? Or i should just stick with my starter lens?

Next thing is tripod, i don't want to buy manfroto since its too expensive and itll just won't fit in my budget. Any good tripod suggestion? A tripod that could hold my camera and won't easily break: D

Then lightings, I need those diffuser box thingy and a light(would flash do?). I want to have that good spotlight to give my video a nice color and less noise. LOL my flash sucks, really old like 10 years ago(my mom used it with her manual slr cam, pretty sick though). Suggestions anyone?

And then the backdrop, how do you even setup that lol. Do i have to paint? Or i could just use a nice smooth cloth because i don't want to paint my room.

I was hoping to make videos like the boyce avenue on youtube, really clean videography.

Here's my vid in youtube:

I only used my imac's cam for tht lol. I want to have a 720p or 1080p vids next time. And i want to have a really good soft focus. (Nevermind about my voice haha)

Links or video tutorial would also be great help: D
Please no negative answers.

You spent a lot of money for your Mac.

A good, sturdy tripod like that Manfrotto is a must if you intend to shoot video. What you missed is that you will also need a fluid head. They can cost more than the tripod.

Flash will NOT work when shooting video. You must use continuous lighting. I use Lowel Tota-lights with umbrellas to shoot video.