I have one of these, used it last summer and just LOVE it! No tree straps included, but in addition to some straps, there are some other things you might want/need.
1 - Get some 1" poly webbing with cam buckles and hooks. Harbor Freight has a pair of them for around $10. The poly straps wont stretch like nylon straps do and these are well over half the price (and longer and better) than getting Slap Straps or any other “strap system” from the hammock makers. Also, the cam buckles are nice in that they are easy to adjust (if you wrap it correctly around a tree). Once you clip your hammock into the strap’s hooks, you can then use the cam buckle to take in or let more length out of your hammock for more/less arch and get that perfect angle without doing much work.
2 - Get a decent length of para cord. It’s infinitely useful for camping and hanging things. You will use this as a ridgeline over your hammock to either hang stuff or to hang Point #3.
3 - Cheap tarp. Get a cheap long rectangular tarp from somewhere like HarborFreight or wherever. This will be your rain fly and doesn’t cost a ton. It should be large enough to cover the entire length of your hammock’s straps from both mount points. This will keep even torrential downpours out and let you sleep completely dry (vs a rain fly).
4 - Get some cheap tent stakes, the metal stick kind not the plastic kind. These will be used to stake down your tarp should you need to use it. $4? from WalMart or wherever.
5 - Get a small stuff sack (army navy store, camping supply store, wherever, costs $5) to store everything but the hammock and tarp in (straps, stakes, paracord, etc).
Hope this helps!