@rkoo
For clubbells, you are strong enough to handle 20 or 25lbs for most one arm or double (one clubbell in each hand) ballistic drills and 35lbs for most two-handed drills.
However, you are probably better off learning with 15s for single and double drills and 25 for two-handed drills. Even after you can handle heavier clubbells, lighter CBs can still be very useful for some grinding drills where you are at a big leverage disadvantage and higher rep or mobility-focused use.
For maces, 20lbs is probably a reasonable weight that is not too heavy to learn on, but will still give you plenty of use as you progress.
I tend to use my clubbells for a wide variety of drills and a combination of heavier strength training and higher rep training, so a variety of weights is useful. For my maces, I tend to stick with what I consider the two "killer app" mace drills, 360s and 10-2s, and do them for high volume, so I don't feel as much need for a variety of weights.
As to specific clubs, I use the Rmax CST clubs. I haven't tried the Onnit steel clubs, but there are two reasons I don't think I would like them as much. They are shorter than the Rmax clubs for each given weight, and they have a very large knob at the end of the handle. The knob is important because too large a knob will hit your wrist and interfere with your wrist position. This happens to a small degree with the Rmax clubs already and the Onnit knob is much bigger (of course no knob or too small a knob would make the club very easy to drop).
If you get on the Rmax email list, they periodically have 20% off sales.
For maces, I use plate-loadable maces from Strongergrip.com. The plate-loading system is very secure, but a little awkward to use, requiring two different size allen wrenches to change plates. You also need 1" hole plates (pancake style work best; mine are CAP brand). I like being able to change weights without buying a bunch of different maces, but tend to stick with one weight for long periods of time.
I have one with a thicker 40" handle, and one with a thinnner 48" handle that is more like the ShoulderRok (length of the handle only; the overall length including the plates is a little longer). I like the feel of the longer handle, which is longer than the Onnit or IronCompany maces for example and which ShoulderRok promotes as a feature. The problem with the longer handle is that it is too long to use indoors in my house (I'm about 5'10" in shoes). The shorter one is fine for indoor use, but might not be for someone taller.
Hope this helps.