Hello and congratulations :)
The first thing to do would be to decide on a budget.
Secondly decide on your needs -
- Do you use pblic transport?
If yes you will need something that folds easily in one piece and is not too bulky.
- Is car boot size an issue?
Measure it and check your dimensions against pushchairs online.
- Is storage an issue?
Again measure space if needed.
- How will it be used?
Walking, transport, rough ground (cobbles, grass etc), shopping centres, smooth pavements can all narrow down your search.
- Do you want any additional features?
Parent facing, car seat / carrycot which clips onto frame.
Lastly have a think if one pushchair would suit all your needs, in my (rather expensive) experience it was great for em to have a big pushchair for walking and a smaller one for transport or trips to swimming etc, but a sling can easily be used for these things.