Performing tamaatu hajj if umrah was done in the months of hajj

Q: I have performed Umrah recently on 13 Zul Qadah. Reason was that I had to stay in Jeddah and leave for HAJJ on 7 zul hajj from Jeddah. I was told to perform umrah then go to jeddah as I was coming from taif. Now, can I perform niyyah of ifrad or tamattu?

If I perform Ifrad, must I do qurbaani? If so, will it be considered as wajib or sunnah?

I am staying in Jeddah for 3 weeks but my desire is to perform Ifrad hajj as in Ifrad it's sunnah and person of Ifrad is free to go for tawaf ziyaarah after rami and qasr. I prefer Ifrad but umrah in shawwal & zulqadah am I obliged for tamattu or niyyah counts?

Performing Salaah behind a Salafi Imaam

Q: Please give us guidance on the following:

1. We hear that Salafi’s don’t follow any Mazhab. Does this mean they are on the wrong path?

2. Will it be permissible to perform Salaah behind a Salafi Imaam and will the Salaah be in order?

3. Are the Saudi Imaam’s Salafi’s?

4. Does being a Salafi affect your belief’s, Imaan, fasting, haj, etc.?

Your comments will be appreciated.