I started out with nothing and always struggled to get by with whatever I had kicking around. Just go with what you can pull together until you can afford more but the ideal situation for your size tent would be quantum boards. They are low cost (available on Amazon) and can be built up a panel or so at a time. The QB120's are 60 watts a panel and they make panels that go up in power from there but I use a 6 panel group for my veg room. They are about $125 for a set of 4 panels and then you need a driver which is about $80 and some aluminum framing form the hardware store. Frames are just 1" x 1" aluminum angle strips and they are just pop riveted together. Simple hand tools and DC wiring....super easy and a 320 watt fixture only weighs a couple of pounds...easy to hang and deal with in a small area.
Study the LED stickies in the LED section. As far as lighting goes you could go with CMH as well and some of those lights are coming down in price lately and are pretty reasonable. For budgeting a DIY LED system figure about $1.25 per watt for DIY LEDs. For your tent you would need about 320 watts to 400 watts.
Here are some examples I did for my veg area and a strawberry indoor grow:
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