Can you post a photo? What do you have to start with? Here are some sites to start grabbing ideas from . . .
Too open of a question. Million of answers. First start with a scaled drawing to layout what you want. Get your permits. Depending on your skill. Do what you can or get estimates for the remodel. Look at magazines to get ideas. Good luck.
Antonette...How much do you plan to convert or is it a small area?
What is in your basement now? What, if anything, is on the walls? Please give us all a little more information
Georgia Pacific makes a “basement board” which is much less expensive than “green board” or “purple board” which were previously the only to-Code solutions to drywall in basements.
Of course, all sole plates need to be treated lumber & “red headed” into the slab.
I you’re intending on making the basement have a bedroom, then it needs a compliant Egress Window.
In my case, I had to have an existing small window excavated & a proper egress window well, ladder & egress window put in. At $3500 this was cheaper than adding a bedroom on to my house at ground level.
Bedrooms have to have a real closet as well.
Start with a SUPER dry basement or all else will be in vein
How are you presently using the basement space?
If you made changes to the basement, how would you like to see it fixed up so that it better suits your lifestyle, and better meets your needs?
It’s going to depend a lot on how you use the space and whether or not you plan to change its use. I’d start searching images of basements and see what looks good to you, then see how you can adapt the ideas.