To do this right, your cheapest entry would be around $100USD for a pump and cylinder that fits.
Fitment is critical. Try one of the
LAP Dist pump starter kits as their tubes are more cost effective than Vacutech. I think Vacutech has a starter kit for around $120, but their cylinders are top notch.
There are people that build their own out of sun tea jars and related, but for a newbie, I think a starter kit is the way to go.
Here is a sizing chart from LAP-Dist.
Here's Vacutech's sizing Chart
I found that vacutech's chart runs 1 size big for flared, but it's pretty close.
If I knew then, what I know now... I would have:
Purchased a cylinder from either LAP or Vacutech
Purchased the Harbor Freight Brake bleeder pump (Metal is better than vacutech's plastic pump)
Purchased the CFC connectors from McMaster Carr and tubing from home depot and been done.
Honestly though, the prices of the cylinders have gone out of sight...Yowch! I paid only 70-80USD for mine. Now they're clearing $100.
Honestly, pumping works for some, not for others. I would try Jelq first. It's free, there's lots of resources on it.
Also there are many pumpers in your area. Hook up with somebody you trust to "Try it out".
I'm sure just about any of them will lend you a hand
Just make sure you are with someone that isn't pushy, and knows how to pump properly. Stay away from extreme pumpers unless they have cylinders that are cock only and that match your size needed.
The second best under $100, is my traction penis device. I've gained about 0.25" so far from this. Shocker to me, but I wear it at night.
Finally had a full on erection the other day and measured for shits and giggles. Measured bone pressed 6.25".
It's a Extender Pro and I got it on Ebay for around $70.
Shop around, be patient with whatever method you use, post some photos and good luck!