If its painted, I'd honestly try and sell as a complete lot initially. Put the minimum price you are willing to accept and let it loose.
Note there are free listing weekends around every three to four weeks at the mo, think we are due one this or next weekend. So that's always a good time to list as you do get hit by up front seller fees, if it doesn't sell you loose nothing.
If it won't sell together you can try splitting it, once again list the minimum per squad you are willing to take.
This way you won't get caught out with items that you paid £20 for selling for £2-3. Yes some folks won't buy if your starting bid is £10-15, but at least if it sells with that one bid, you are happy with the result, and if it sells for more, its all a bonus.
Don't get caught out by postage, packaging unless you are in a weird position is not free. Plus postage can cost a fair bit, especially if you allow Internationals, and you want some kind of recorded mail. Recorded airmail to the US for example costs about £4.50, before the actual postage and any packaging costs.
However Internationals are well worth it, as Australia gamers for example can actually buy the stuff at new British prices and still be saving a fair bit of money on their own local prices.
Sadly ebay have been a bit scummy on that regard however as they now charge a fee per item to allow all ebay sites around the world to see it, otherwise you have to hope Australians and other international folks are coming direct to the
UK ebay site.
On a final note, the fact they are painted may hurt you in the long run, folks often won't bid on painted items, as they either think they can do better (regardless whether they can or not) don't like your posing, scheme, basing or a hundred other things that mean they'd have to strip all the figures to make them worth while. In which case they'll want them for less than half value.
If they however are painted to a good tabletop standard, or even better, they may well sell to use right out of the box.
Good luck on your travels with ebay, just follow a golden rule and be sure you are selling things for prices you are willing to accept. Nothing worse than sitting there when the auction ends and thinking, I'd rather have kept them for that kind of money.