That really depends on a few different factors...
To me, and of course
ymmv, these are a few points to consider:
1. How easy are the units to play, as in how many different rules do you need to remember?
This one comes down to how many types of models you´re going to have. At first my recommendation would be to do either pure infantry or pure tank lists, and small. So a 500-600pts list, try it and see if you like it.
I haven´t found a specific type of list that is easier than others, but mechanized infantry is seen as difficult to master at the LFGS I frequent.
2. How much is there to paint?
This may not apply to you if you don´t paint at all, but other than that,
FoW infantry lists have a huge amount of models, and can be time consuming to paint. Tank lists can be done in a week or so, with spraycans, decals and a normal brush for tracks and details.
3. What kind of army is visually appealing to me?
This might have been better as the first point. Basically, whatever army you choose you´re going to be looking at it on the table, and it´s no fun playing something you don´t like looking at. So consider whether it´s big hulking tanks, infantry waves, mechanized forces or something else entirely.
A good thing about starting small is that mostly you´ll be able to use whatever models you buy if/when you change to something else. For example a unit of Panzers will do fine in a Grenadier company, and vice versa.
As a final point, I haven´t seen a "Super" list for
FoW yet. There are some lists that are silly good against specific types of enemies, but they will fail horribly against others.
I hope you find something that interests you, if you need advice later in the process, just give a shout.