A third thread on this stuff? Really?
Read this for a bit:
http://www.airsoftsniperforum.com/ - all the questions you've asked have been asked and answered a thousand times over. Not only that, but you're summarising pretty complicated questions into single sentences so you're never going to get complete answers from the small set of us here.
You're lucky the regulars here are so forgiving and ready to answer questions that've been asked a lot already.
Anyhoo, if you haven't the budget for a TM VSR then I don't know where the rest of your gear fits in. Best hop on eBay and look for surplus or second hander decent repros like Flyye.
I hate to be a downer, but you really, really don't know what you're in for. Airsoft sniping is expensive, and a two-tone just will not do against the backdrop of a forest. It's generally the given advice to never start off sniping when you get into airsoft. The people you watch know the sites they're playing at (or are playing with people who know them) and know the various methods, have the patience, skill and money to make sure they're competitive against people who can still shoot 70% of your range and at a far greater rate of fire.
If you go in as a beginner with little to no knowledge then you will get your arse handed to you every time, and you will probably not enjoy it with no basic AEG to fall back on. It may even taint your opinion of airsoft enough to get you to quit. I don't think there's anyone here who hasn't seen someone do exactly that over the years, so please don't be that guy.
Do things right and read these threads. Treat your experience as a total beginner and don't blinker yourself just to sniping to start off with:
http://www.airsoft-forums.co.uk/index.php/topic/3779-the-beginners-guide-to-airsoft/
http://www.airsoft-forums.co.uk/index.php/topic/17294-ians-guide-to-noobism-on-a-tight-budget/