I suggest that you do some study, yourself, on power supplies. It is good etiquette. It is best that you develop the skills to do basic research. After that, we would be glad to help with any remaining questions. But, you certainly need some direction, to even know where to start.
Factors to consider
1) Type of supply; Linear, or Switching. Each has its place.
2) Wattage needed; Depends on the type of work it will be used for. But, 30v and 3a is typical, of basic models.
3) Does it have course and fine adjustments?
4) Digital readout, or analog meters?
5) Does it have Constant Current and/or Constant Voltage?
3) Number of Outputs; Single, Double, Triple...
4) Quality
5) Budget
Start with a search, within this forum. There are other threads on this subject. And, maybe look at some YouTube videos.
Let us know, what you discover. Then, for any questions that you have, give us the details, of what you plan to do with it, etc.
Don't be discouraged, we will help you. And, I was given this same advice, when I started posting here. It paid off. :-)