Help with inventory levels needed

Not knowing your products or the pricing, it really is hard to say.
You may just have to stock several of each, then if sales are greater than expected, order accordingly. Of course this may mean you are out of stock and should say so. BUT you can put a notice of such and do as Amazon.com and Not charge their card until the item has come in. Or give a slight discount coupon for not having the item in. Then capture their information and notify them when the item is in stock.
But you are not going to know how much you should stock until you have done some testing and gained experience in the matter.

Good Luck!

JL

I think its better you stock every product you sell a bit so you don't ran out of products when some customers looking for a particular product.

Found 3 plataforms that seems more solid.

Anyone tried one of those below?

Linnworks

or

Enterprise Software for Drop Shipping | DropShip Commerce

or
Ordoro

Concentrate on offering a volume (large selection) of inventory at first with plans on narrowing down.

I'm going to relate my experiences in selling things such as clothing accessories and cell phone accessories.

To financial be able to offer a large selection of inventory you will most likely be investing in inventory of anywhere between 1 and 5 pcs per item, of as many different items as possible. You are spreading yourself thin, but if your profit margin is good then you can still survive while narrowing down the most commonly viewed items and most commonly purchased items which gives you more knowledge of the items your target audience is interested in.

Never show "This is out of stock" - because this is something that turns away customers. Not only from the item, but from your entire website and your potential customer is unlikely to return. You can instead allow them to Checkout as regular, input their purchase information such as their credit card details

When I started a side businesses selling phone accessories, I had to purchase a large variety of products so that I can have each one photographed and detailed. Out of all of my inventory, only about 20% of it was getting attention from buyers. I might have seen a purchase for one of my lesser known products, but it wasn't worth investing $2.00 for a case, the cost of overhead in photographing it and databasing it, and letting it sit in my warehouse for 5 months before it was sold. I classified my inventory as "Hot" "Medium" and "Cold" and made it so my total purchase amounts typically consisted of 80% going towards Hot items, 15% towards Medium, and 5% towards Cold - which were usually items that I THOUGHT might be hot but had no prior evidence as being so from other sellers or my own data. Im usually right, such as buying a Ninja Turtles iPhone 4s Case that was just made by manufacturers (or something like that), and I can move that to another category.

When you are able to narrow down your purchases to what customers are most likely to purchase then that is when your profit margin increases. You can go from the standard wholesale rate when you buy 1 or 5 of a specific item, to reduced wholesale rates when you buy 100 of the same item. This could be a reduction in an individual price such as paying $2.00 per item when buy 5 to paying $0.80 per item when you buy 100.

Many people who utilize dropshipping go from dropshipping 1000 different items to then investing in inventory of 100 different items. If they stayed with dropshipping after narrowing down, they wouldn't be able to "reap the rewards" of a high profit margin per item when the negotiate for bulk purchases.

What to do with inventory that doesn't sell is you can offer it as freebies to past customers who made a large purchase, people who fully register but don't buy anything, or offer them at a low price (a sale).