Bugsy has given you a good list.
I would add to it some way to listen to your work. Some "near-field" monitor speakers or some good headphones. Since most voice-over work is destined to be heard on speakers, you may want to go that route.
Let's talk about "good enough for now". If you are committed to this project and you have some assurance you are likely to generate some business, then you may want to write several checks or present the plastic card multiple times and do it all at one time.
If you have reason to tip-toe into this project one step at a time, work out a priority list of which items need to come first and what can wait. That's a tough call for any of us to try to do for you. There is the practical aspect: What do I need in order to generate some income NOW! Then there is the emotional and motivational aspect. Can you get your head to the point where you can voice great stuff even though you know you don't have everything in place?
I have been "building" my set-up one step at a time.
You have to have a mic of some kind in order to even do daily practice runs. (I think making your voice work the way you want is like playing the piano or the violin. You need to "play it" every day. If your budget allows, get a mic like Bugsy listed. There are others in the same price and quality range. Many of the highly recommended mics (including the ones Bugsy likes) are the choice of MALE voices. Go to the websites of femal V-O people and see if they are listing their mics. See if female voices who are far enough along to have their own websites have any other mics they like.
The mic is the first place your voice goes. If you are not ready to pop for the ultimate long-term mic choice yet there are some pretty darned good mics in the $90 to $150 range that are good enough that you can learn to use your compression, limiter and equalization. You can also get a feel for the adequacy of your studio acoustics with something as bland as a dynamic Shure SM-57 or SM-58. Samson and Audio Technica both offer a decent little cardioid condenser in the $150 range.
Only you can make some of these decisions based on how fast you think to can get up to speed in the world of V-O.